[Infra] Fix issue templates (#6455)

Co-authored-by: Piotr Kiełkowicz <pkiekowicz@splunk.com>

.clomonitor.yml

@@ -0,0 +1,4 @@
+# see https://github.com/cncf/clomonitor/blob/main/docs/checks.md#exemptions
+exemptions:
+  - check: artifacthub_badge
+    reason: "Artifact Hub doesn't support .NET packages"

.editorconfig

@@ -10,6 +10,9 @@ indent_size = 2
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[*.sh]
+end_of_line = lf
+
 [*.{cs,cshtml,htm,html,md,py,sln,xml}]
 indent_size = 4
 
@@ -41,7 +44,7 @@ csharp_indent_labels = flush_left
 
 # Modifier preferences
 csharp_preferred_modifier_order = public,private,protected,internal,file,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,required,volatile,async:suggestion
-dotnet_style_require_accessibility_modifiers = for_non_interface_members:silent
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
 
 # this. preferences
 dotnet_style_qualification_for_field = true:suggestion
@@ -53,8 +56,8 @@ dotnet_style_qualification_for_event = true:suggestion
 csharp_style_var_for_built_in_types = true:silent
 csharp_style_var_when_type_is_apparent = true:silent
 csharp_style_var_elsewhere = true:silent
-dotnet_style_predefined_type_for_locals_parameters_members = true:silent
-dotnet_style_predefined_type_for_member_access = true:silent
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
 
 # name all constant fields using PascalCase
 dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
@@ -75,6 +78,7 @@ dotnet_style_readonly_field = true:suggestion
 csharp_style_implicit_object_creation_when_type_is_apparent = true:suggestion
 dotnet_style_prefer_simplified_interpolation = true:suggestion
 dotnet_style_object_initializer = true:suggestion
+csharp_style_prefer_primary_constructors = false:none
 
 # Expression-level preferences
 dotnet_style_object_initializer = true:suggestion
@@ -82,21 +86,23 @@ dotnet_style_collection_initializer = true:suggestion
 dotnet_style_explicit_tuple_names = true:suggestion
 dotnet_style_coalesce_expression = true:suggestion
 dotnet_style_null_propagation = true:suggestion
-dotnet_style_prefer_is_null_check_over_reference_equality_method = true:silent
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
 dotnet_style_prefer_inferred_tuple_names = true:suggestion
 dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
-dotnet_style_prefer_auto_properties = true:silent
-dotnet_style_prefer_conditional_expression_over_assignment = true:silent
-dotnet_style_prefer_conditional_expression_over_return = true:silent
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:suggestion
+dotnet_style_prefer_conditional_expression_over_return = true:suggestion
 csharp_prefer_simple_default_expression = true:suggestion
+csharp_style_unused_value_expression_statement_preference = discard_variable:none
 
 # Expression-bodied members
-csharp_style_expression_bodied_methods = false:silent
-csharp_style_expression_bodied_constructors = false:silent
-csharp_style_expression_bodied_operators = false:silent
-csharp_style_expression_bodied_properties = true:silent
-csharp_style_expression_bodied_indexers = true:silent
-csharp_style_expression_bodied_accessors = true:silent
+csharp_style_expression_bodied_methods = true:suggestion
+dotnet_diagnostic.IDE0022.severity = suggestion # dotnet format doesn't respect the suggestion in the line above
+csharp_style_expression_bodied_constructors = false:warning
+csharp_style_expression_bodied_operators = true:suggestion
+csharp_style_expression_bodied_properties = true:suggestion
+csharp_style_expression_bodied_indexers = true:suggestion
+csharp_style_expression_bodied_accessors = true:suggestion
 
 # Pattern matching
 csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
@@ -113,6 +119,7 @@ csharp_style_prefer_range_operator = false:none
 csharp_style_pattern_local_over_anonymous_function = true:suggestion
 csharp_style_deconstructed_variable_declaration = true:suggestion
 csharp_style_namespace_declarations = file_scoped:warning
+dotnet_style_namespace_match_folder = false:none
 
 # Space preferences
 csharp_space_after_cast = false
@@ -128,10 +135,10 @@ csharp_space_between_method_declaration_parameter_list_parentheses = false
 csharp_space_between_parentheses = false
 
 # Parentheses preferences
-dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:silent
-dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:silent
-dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:silent
-dotnet_style_parentheses_in_other_operators = never_if_unnecessary:silent
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:suggestion
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:suggestion
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:suggestion
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary:suggestion
 
 # Code analyzers
 # CA1031: Do not catch general exception types
@@ -152,7 +159,14 @@ dotnet_diagnostic.IDE0005.severity = warning
 # RS0041: Public members should not use oblivious types
 dotnet_diagnostic.RS0041.severity = suggestion
 
-[obj/**.cs]
+[*Tests.cs]
+# CA1515: Disable making types internal for Tests classes. It is required by xunit
+dotnet_diagnostic.CA1515.severity = none
+
+# CA2007: Disable Consider calling ConfigureAwait on the awaited task. It is not working with xunit
+dotnet_diagnostic.CA2007.severity = none
+
+[**/obj/**.cs]
 generated_code = true
 
 [*.csproj]

.gitattributes

@@ -0,0 +1 @@
+*.sh eol=lf

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,45 +0,0 @@
----
-name: Bug Report
-about: Create a report to help us improve
-labels: bug
----
-
-# Bug Report
-
-List of [all OpenTelemetry NuGet
-packages](https://www.nuget.org/profiles/OpenTelemetry) and version that you are
-using (e.g. `OpenTelemetry 1.0.2`):
-
-* TBD
-
-Runtime version (e.g. `net462`, `net48`, `netcoreapp3.1`, `net6.0` etc. You can
-find this information from the `*.csproj` file):
-
-* TBD
-
-## Symptom
-
-A clear and concise description of what the bug is.
-
-**What is the expected behavior?**
-
-What did you expect to see?
-
-**What is the actual behavior?**
-
-What did you see instead?
-
-## Reproduce
-
-Create a self-contained project using the template of your choice, apply the
-minimum required code to result in the issue you're observing.
-
-We will close this issue if:
-
-* The repro project you share with us is complex. We can't investigate custom
-  projects, so don't point us to such, please.
-* If we can not reproduce the behavior you're reporting.
-
-## Additional Context
-
-Add any other context about the problem here.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,94 @@
+name: Bug report
+title: "[bug] "
+description: Create a report to help us improve
+labels: [bug,needs-triage]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report! Please make sure to fill out the entire form below, providing as much context as you can in order to help us triage and track down the bug as quickly as possible.
+
+        Before filing a bug, please be sure you have searched through [existing bugs](https://github.com/open-telemetry/opentelemetry-dotnet/issues?q=is%3Aissue+is%3Aopen+label%3Abug) to see if an existing issue covers the bug.
+
+  - type: dropdown
+    id: package
+    attributes:
+      label: Package
+      description: Which NuGet package does this bug report concern?
+      multiple: false
+      options:
+        - OpenTelemetry
+        - OpenTelemetry.Api
+        - OpenTelemetry.Api.ProviderBuilderExtensions
+        - OpenTelemetry.Exporter.Console
+        - OpenTelemetry.Exporter.InMemory
+        - OpenTelemetry.Exporter.OpenTelemetryProtocol
+        - OpenTelemetry.Exporter.Prometheus.AspNetCore
+        - OpenTelemetry.Exporter.Prometheus.HttpListener
+        - OpenTelemetry.Exporter.Zipkin
+        - OpenTelemetry.Extensions.Hosting
+        - OpenTelemetry.Extensions.Propagators
+        - OpenTelemetry.Shims.OpenTracing
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Package Version
+      description: List of [all OpenTelemetry NuGet packages](https://www.nuget.org/profiles/OpenTelemetry) and version that you are using (e.g. `OpenTelemetry 1.0.2`)
+      value: |
+        | Package Name                          | Version |
+        | ------------------------------------- | ------- |
+        | OpenTelemetry.Api                     | 1.8.0   |
+        | OpenTelemetry                         | 1.8.0   |
+        | TBD                                   | TBD     |
+    validations:
+      required: true
+
+  - type: input
+    attributes:
+      label: Runtime Version
+      description: What .NET runtime version did you use? (e.g. `net462`, `net48`, `net8.0`, etc. You can find this information from the `*.csproj` file)
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Description
+      description: What happened? Please provide as much detail as you reasonably can.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Steps to Reproduce
+      description: Provide a [minimal, reproducible example](https://stackoverflow.com/help/minimal-reproducible-example). We will close the issue if the repro project you share with us is complex or we cannot reproduce the behavior you are reporting. We cannot investigate custom projects, so don't point us to such, please.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Expected Result
+      description: What did you expect to see?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Actual Result
+      description: What did you see instead?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional Context
+      description: Any additional information you think may be relevant to this issue.
+
+  - type: dropdown
+    attributes:
+      label: Tip
+      description: This element is static, used to render a helpful sub-heading for end-users and community members to help prioritize issues. Please leave as is.
+      options:
+        - "<sub>[React](https://github.blog/news-insights/product-news/add-reactions-to-pull-requests-issues-and-comments/) with :+1: to help prioritize this issue. Please use comments to provide useful context, avoiding `+1` or `me too`, to help us triage it. Learn more [here](https://opentelemetry.io/community/end-user/issue-participation/).</sub>"
+      default: 0

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,7 @@
+# https://docs.github.com/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository#configuring-the-template-chooser
+
+blank_issues_enabled: false
+contact_links:
+  - name: Question
+    url: https://github.com/open-telemetry/opentelemetry-dotnet/discussions/new?category=q-a
+    about: Ask a question to help us improve our knowledge base and documentation.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,29 +0,0 @@
----
-name: Feature Request
-about: Suggest an idea for this project
-labels: enhancement
----
-
-# Feature Request
-
-Before opening a feature request against this repo, consider whether the feature
-should/could be implemented in the [other OpenTelemetry client
-libraries](https://github.com/open-telemetry/). If so, please [open an issue on
-opentelemetry-specification](https://github.com/open-telemetry/opentelemetry-specification/issues/new)
-first.
-
-**Is your feature request related to a problem?**
-
-If so, provide a concise description of the problem.
-
-**Describe the solution you'd like:**
-
-What do you want to happen instead? What is the expected behavior?
-
-**Describe alternatives you've considered.**
-
-Which alternative solutions or features have you considered?
-
-## Additional Context
-
-Add any other context about the feature request here.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,63 @@
+name: Feature request
+title: "[feature request] "
+description: Suggest an idea for this project
+labels: [enhancement,needs-triage]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request! Please make sure to fill out the entire form below, providing as much context as you can in order to help us triage and track down your request as quickly as possible.
+
+        Before opening a feature request, consider whether the feature should/could be implemented in the [other OpenTelemetry client libraries](https://github.com/open-telemetry/). If so, please [open an issue on opentelemetry-specification](https://github.com/open-telemetry/opentelemetry-specification/issues/new) first.
+
+  - type: dropdown
+    id: package
+    attributes:
+      label: Package
+      description: Which NuGet package does this feature request concern?
+      multiple: false
+      options:
+        - OpenTelemetry
+        - OpenTelemetry.Api
+        - OpenTelemetry.Api.ProviderBuilderExtensions
+        - OpenTelemetry.Exporter.Console
+        - OpenTelemetry.Exporter.InMemory
+        - OpenTelemetry.Exporter.OpenTelemetryProtocol
+        - OpenTelemetry.Exporter.Prometheus.AspNetCore
+        - OpenTelemetry.Exporter.Prometheus.HttpListener
+        - OpenTelemetry.Exporter.Zipkin
+        - OpenTelemetry.Extensions.Hosting
+        - OpenTelemetry.Extensions.Propagators
+        - OpenTelemetry.Shims.OpenTracing
+
+  - type: textarea
+    attributes:
+      label: Is your feature request related to a problem?
+      description: If so, provide a concise description of the problem.
+
+  - type: textarea
+    attributes:
+      label: What is the expected behavior?
+      description: Describe the solution you would like.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Which alternative solutions or features have you considered?
+      description: Describe alternatives you've considered.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Any additional information you think may be relevant to this feature request.
+
+  - type: dropdown
+    attributes:
+      label: Tip
+      description: This element is static, used to render a helpful sub-heading for end-users and community members to help prioritize issues. Please leave as is.
+      options:
+        - "<sub>[React](https://github.blog/news-insights/product-news/add-reactions-to-pull-requests-issues-and-comments/) with :+1: to help prioritize this issue. Please use comments to provide useful context, avoiding `+1` or `me too`, to help us triage it. Learn more [here](https://opentelemetry.io/community/end-user/issue-participation/).</sub>"
+      default: 0

.github/ISSUE_TEMPLATE/question.md

@@ -1,9 +0,0 @@
----
-name: Question
-about: Create a question to help us improve our knowledge base and documentation
-labels: question
----
-
-# Question
-
-Use [Github Discussions](https://github.com/open-telemetry/opentelemetry-dotnet/discussions/new).

.github/codecov.yml

@@ -33,22 +33,22 @@ ignore:
   - "test"
 
 flags:
-  unittests-Solution-Stable:
+  unittests-Solution:
     carryforward: true
     paths:
       - src
 
-  unittests-Solution-Experimental:
+  unittests-Project-Stable:
     carryforward: true
     paths:
       - src
 
-  unittests-Instrumentation-Stable:
+  unittests-Project-Experimental:
     carryforward: true
     paths:
       - src
 
-  unittests-Instrumentation-Experimental:
+  unittests-UnstableCoreLibraries-Experimental:
     carryforward: true
     paths:
       - src

.github/dependabot.yml

@@ -6,3 +6,70 @@ updates:
       interval: "daily"
     labels:
       - "infra"
+  - package-ecosystem: "docker"
+    directory: "/examples/MicroserviceExample/WebApi"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+    labels:
+      - "infra"
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-major"
+          - "version-update:semver-minor"
+  - package-ecosystem: "docker"
+    directory: "examples/MicroserviceExample/WorkerService"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+    labels:
+      - "infra"
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-major"
+          - "version-update:semver-minor"
+  - package-ecosystem: "docker"
+    directory: "test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/IntegrationTest"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+    labels:
+      - "infra"
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-major"
+          - "version-update:semver-minor"
+  - package-ecosystem: "docker"
+    directory: "test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+    labels:
+      - "infra"
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-major"
+          - "version-update:semver-minor"
+  - package-ecosystem: "dotnet-sdk"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+    labels:
+      - "infra"
+    ignore:
+      - dependency-name: "*"
+        update-types:
+          - "version-update:semver-major"
+          - "version-update:semver-minor"
+  - package-ecosystem: "pip"
+    directory: "test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+    labels:
+      - "infra"

.github/workflows/Component.BuildTest.yml

@@ -20,14 +20,17 @@ on:
         required: false
         type: string
       os-list:
-        default: '[ "windows-latest", "ubuntu-latest" ]'
+        default: '[ "windows-latest", "ubuntu-22.04", "ubuntu-22.04-arm" ]'
         required: false
         type: string
       tfm-list:
-        default: '[ "net462", "net6.0", "net7.0", "net8.0" ]'
+        default: '[ "net462", "net8.0", "net9.0" ]'
         required: false
         type: string
 
+permissions:
+  contents: read
+
 jobs:
   build-test:
 
@@ -37,20 +40,30 @@ jobs:
         os: ${{ fromJSON(inputs.os-list) }}
         version: ${{ fromJSON(inputs.tfm-list) }}
         exclude:
-        - os: ubuntu-latest
+        - os: ubuntu-22.04
           version: net462
+        - os: ubuntu-22.04-arm
+          version: net462
+        - os: ubuntu-22.04-arm
+          version: net8.0
 
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       with:
         # Note: By default GitHub only fetches 1 commit. MinVer needs to find
         # the version tag which is typically NOT on the first commit so we
         # retrieve them all.
         fetch-depth: 0
 
-    - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+    - name: Setup previous .NET runtimes
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
+      with:
+        dotnet-version: |
+          8.0.x
+
+    - name: Setup .NET
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
     - name: dotnet restore ${{ inputs.project-name }}
       run: dotnet restore ${{ inputs.project-name }} ${{ inputs.project-build-commands }}
@@ -59,24 +72,44 @@ jobs:
       run: dotnet build ${{ inputs.project-name }} --configuration Release --no-restore ${{ inputs.project-build-commands }}
 
     - name: dotnet test ${{ inputs.project-name }}
-      run: dotnet test ${{ inputs.project-name }} --collect:"Code Coverage" --results-directory:TestResults --framework ${{ matrix.version }} --configuration Release --no-restore --no-build --logger:"console;verbosity=detailed" -- RunConfiguration.DisableAppDomain=true
+      run: >
+        dotnet test ${{ inputs.project-name }}
+        --collect:"Code Coverage"
+        --results-directory:TestResults
+        --framework ${{ matrix.version }}
+        --configuration Release
+        --no-restore
+        --no-build
+        --logger:"console;verbosity=detailed"
+        --logger:"GitHubActions;report-warnings=false"
+        --logger:"junit;LogFilePath=TestResults/junit.xml"
+        -- RunConfiguration.DisableAppDomain=true
 
     - name: Install coverage tool
       run: dotnet tool install -g dotnet-coverage
 
     - name: Merging test results
-      run: dotnet-coverage merge -r -f cobertura -o ./TestResults/Cobertura.xml ./TestResults/*.coverage
+      run: dotnet-coverage merge -f cobertura -o ./TestResults/Cobertura.xml ./TestResults/**/*.coverage
 
     - name: Upload code coverage ${{ inputs.code-cov-prefix }}-${{ inputs.code-cov-name }}
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@fdcc8476540edceab3de004e990f80d881c6cc00 # v5.5.0
       continue-on-error: true # Note: Don't fail for upload failures
       env:
         OS: ${{ matrix.os }}
         TFM: ${{ matrix.version }}
-        token: ${{ secrets.CODECOV_TOKEN }}
       with:
-        file: TestResults/Cobertura.xml
+        files: TestResults/Cobertura.xml
         env_vars: OS,TFM
         flags: ${{ inputs.code-cov-prefix }}-${{ inputs.code-cov-name }}
         name: Code Coverage for ${{ inputs.code-cov-prefix }}-${{ inputs.code-cov-name }} on [${{ matrix.os }}.${{ matrix.version }}]
         codecov_yml_path: .github/codecov.yml
+        token: ${{ secrets.CODECOV_TOKEN }}
+
+    - name: Upload test results ${{ inputs.code-cov-prefix }}-${{ inputs.code-cov-name }}
+      if: ${{ !cancelled() && hashFiles('./**/TestResults/junit.xml') != '' }}
+      uses: codecov/test-results-action@47f89e9acb64b76debcd5ea40642d25a4adced9f # v1.1.1
+      with:
+        env_vars: OS,TFM
+        flags: ${{ inputs.code-cov-prefix }}-${{ inputs.code-cov-name }}
+        name: Test results for ${{ inputs.code-cov-prefix }}-${{ inputs.code-cov-name }} on [${{ matrix.os }}.${{ matrix.version }}]
+        token: ${{ secrets.CODECOV_TOKEN }}

.github/workflows/add-labels.yml

@@ -0,0 +1,58 @@
+name: 'Add labels to issues and pull requests'
+on:
+  issues:
+    types: [ opened ]
+
+  pull_request_target:
+    branches: [ 'main*' ]
+
+permissions:
+  contents: read
+
+jobs:
+  add-labels-on-issues:
+    permissions:
+      issues: write
+    if: github.event_name == 'issues' && !github.event.issue.pull_request
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: check out code
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+      - name: Add labels for package found in bug issue descriptions
+        shell: pwsh
+        run: |
+          Import-Module .\build\scripts\add-labels.psm1
+
+          AddLabelsOnIssuesForPackageFoundInBody `
+            -issueNumber ${{ github.event.issue.number }} `
+            -issueBody $env:ISSUE_BODY
+        env:
+          GH_TOKEN: ${{ github.token }}
+          ISSUE_BODY: ${{ github.event.issue.body }}
+
+  add-labels-on-pull-requests:
+    permissions:
+      pull-requests: write
+    if: github.event_name == 'pull_request_target'
+
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: check out code
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          ref: ${{ github.event.repository.default_branch }} # Note: Do not run on the PR branch we want to execute add-labels.psm1 from main on the base repo only because pull_request_target can see secrets
+
+      - name: Add labels for files changed on pull requests
+        shell: pwsh
+        run: |
+          Import-Module .\build\scripts\add-labels.psm1
+
+          AddLabelsOnPullRequestsBasedOnFilesChanged `
+            -pullRequestNumber ${{ github.event.pull_request.number }} `
+            -labelPackagePrefix 'pkg:'
+        env:
+          GH_TOKEN: ${{ github.token }}

.github/workflows/automation.yml

@@ -0,0 +1,37 @@
+name: Resolve automation settings
+
+on:
+  workflow_call:
+    outputs:
+      enabled:
+        value: ${{ jobs.resolve-automation.outputs.enabled == 'true' }}
+      token-secret-name:
+        value: ${{ jobs.resolve-automation.outputs.token-secret-name }}
+      username:
+        value: ${{ vars.AUTOMATION_USERNAME }}
+      email:
+        value: ${{ vars.AUTOMATION_EMAIL }}
+    secrets:
+      OPENTELEMETRYBOT_GITHUB_TOKEN:
+        required: false
+
+permissions:
+  contents: read
+
+jobs:
+  resolve-automation:
+
+    runs-on: ubuntu-22.04
+
+    outputs:
+      enabled: ${{ steps.evaluate.outputs.enabled }}
+      token-secret-name: ${{ steps.evaluate.outputs.token-secret-name }}
+
+    env:
+      OPENTELEMETRYBOT_GITHUB_TOKEN_EXISTS: ${{ secrets.OPENTELEMETRYBOT_GITHUB_TOKEN != '' }}
+
+    steps:
+    - id: evaluate
+      run: |
+        echo "enabled=${{ env.OPENTELEMETRYBOT_GITHUB_TOKEN_EXISTS == 'true' }}" >> "$GITHUB_OUTPUT"
+        echo "token-secret-name=OPENTELEMETRYBOT_GITHUB_TOKEN" >> "$GITHUB_OUTPUT"

.github/workflows/ci.yml

@@ -9,6 +9,9 @@ on:
   pull_request:
     branches: [ 'main*' ]
 
+permissions:
+  contents: read
+
 jobs:
   lint-misspell-sanitycheck:
     uses: ./.github/workflows/sanitycheck.yml
@@ -18,22 +21,23 @@ jobs:
     outputs:
       changes: ${{ steps.changes.outputs.changes }}
     steps:
-    - uses: actions/checkout@v4
-    - uses: AurorNZ/paths-filter@v4
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: AurorNZ/paths-filter@3b1f3abc3371cca888d8eb03dfa70bc8a9867629 # v4.0.0
       id: changes
       with:
         filters: |
           md: ['**.md']
-          build: ['build/**', '.github/**/*.yml', '**/*.targets', '**/*.props']
+          build: ['build/**', '.github/**/*.yml', '**/*.targets', '**/*.props', 'global.json']
           shared: ['src/Shared/**']
           code: ['**.cs', '**.csproj', '.editorconfig']
+          solution: ['OpenTelemetry.sln']
           packaged-code: ['src/**', '!**/*.md']
           api-code: ['*/OpenTelemetry.Api*/**', '!**/*.md']
           api-packages: ['src/OpenTelemetry.Api*/**', '!**/*.md']
           instrumentation: ['*/OpenTelemetry.Instrumentation*/**', 'test/TestApp.AspNetCore/**', '!**/*.md']
-          instrumentation-packages: ['src/OpenTelemetry.Instrumentation*/**', '!**/*.md']
           sdk-code: ['src/OpenTelemetry/**', 'test/OpenTelemetry.Tests/**', '!**/*.md']
           sdk-package: ['src/OpenTelemetry/**', '!**/*.md']
+          unstable-core-packages: ['src/OpenTelemetry.Exporter.Prometheus.AspNetCore/**', 'src/OpenTelemetry.Exporter.Prometheus.HttpListener/**', 'src/OpenTelemetry.Shims.OpenTracing/**', '!**/*.md']
           otlp: ['*/OpenTelemetry.Exporter.OpenTelemetryProtocol*/**', '!**/*.md']
 
   lint-md:
@@ -50,7 +54,18 @@ jobs:
       || contains(needs.detect-changes.outputs.changes, 'build')
     uses: ./.github/workflows/dotnet-format.yml
 
-  build-test-solution-stable:
+  build-test-solution:
+    needs: detect-changes
+    if: |
+      contains(needs.detect-changes.outputs.changes, 'solution')
+      || contains(needs.detect-changes.outputs.changes, 'build')
+      || contains(needs.detect-changes.outputs.changes, 'shared')
+    uses: ./.github/workflows/Component.BuildTest.yml
+    with:
+      project-name: 'OpenTelemetry.sln'
+      code-cov-name: 'Solution'
+
+  build-test-project-stable:
     needs: detect-changes
     if: |
       contains(needs.detect-changes.outputs.changes, 'code')
@@ -58,11 +73,11 @@ jobs:
       || contains(needs.detect-changes.outputs.changes, 'shared')
     uses: ./.github/workflows/Component.BuildTest.yml
     with:
-      project-name: 'OpenTelemetry.sln'
+      project-name: './build/OpenTelemetry.proj'
       project-build-commands: '-p:ExposeExperimentalFeatures=false'
-      code-cov-name: 'Solution-Stable'
+      code-cov-name: 'Project-Stable'
 
-  build-test-solution-experimental:
+  build-test-project-experimental:
     needs: detect-changes
     if: |
       contains(needs.detect-changes.outputs.changes, 'code')
@@ -70,35 +85,22 @@ jobs:
       || contains(needs.detect-changes.outputs.changes, 'shared')
     uses: ./.github/workflows/Component.BuildTest.yml
     with:
-      project-name: 'OpenTelemetry.sln'
+      project-name: './build/OpenTelemetry.proj'
       project-build-commands: '-p:ExposeExperimentalFeatures=true'
-      code-cov-name: 'Solution-Experimental'
+      code-cov-name: 'Project-Experimental'
 
-  # Build instrumentation libraries using stable packages released to NuGet
-  build-test-instrumentation-stable:
+  # Build unstable core libraries using stable packages released to NuGet
+  build-test-unstable-core:
     needs: detect-changes
     if: |
-      contains(needs.detect-changes.outputs.changes, 'instrumentation-packages')
+      contains(needs.detect-changes.outputs.changes, 'unstable-core-packages')
       || contains(needs.detect-changes.outputs.changes, 'build')
       || contains(needs.detect-changes.outputs.changes, 'shared')
     uses: ./.github/workflows/Component.BuildTest.yml
     with:
-      project-name: './build/InstrumentationLibraries.proj'
-      project-build-commands: '-p:RunningDotNetPack=true -p:ExposeExperimentalFeatures=false'
-      code-cov-name: 'Instrumentation-Stable'
-
-  # Build instrumentation libraries using stable packages released to NuGet
-  build-test-instrumentation-experimental:
-    needs: detect-changes
-    if: |
-      contains(needs.detect-changes.outputs.changes, 'instrumentation-packages')
-      || contains(needs.detect-changes.outputs.changes, 'build')
-      || contains(needs.detect-changes.outputs.changes, 'shared')
-    uses: ./.github/workflows/Component.BuildTest.yml
-    with:
-      project-name: './build/InstrumentationLibraries.proj'
+      project-name: './build/UnstableCoreLibraries.proj'
       project-build-commands: '-p:RunningDotNetPack=true -p:ExposeExperimentalFeatures=true'
-      code-cov-name: 'Instrumentation-Experimental'
+      code-cov-name: 'UnstableCoreLibraries-Experimental'
 
   otlp-integration-test:
     needs: detect-changes
@@ -108,13 +110,13 @@ jobs:
       || contains(needs.detect-changes.outputs.changes, 'otlp')
       || contains(needs.detect-changes.outputs.changes, 'build')
       || contains(needs.detect-changes.outputs.changes, 'shared')
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix:
-        version: [ net6.0, net7.0, net8.0 ]
+        version: [ net8.0, net9.0 ]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - name: Run OTLP Exporter docker compose
         run: docker compose --file=test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/IntegrationTest/docker-compose.yml --file=build/docker-compose.${{ matrix.version }}.yml --project-directory=. up --exit-code-from=tests --build
 
@@ -126,13 +128,13 @@ jobs:
       || contains(needs.detect-changes.outputs.changes, 'instrumentation')
       || contains(needs.detect-changes.outputs.changes, 'build')
       || contains(needs.detect-changes.outputs.changes, 'shared')
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix:
-        version: [ net6.0, net7.0 ]
+        version: [ net8.0, net9.0 ]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       - name: Run W3C Trace Context docker compose
         run: docker compose --file=test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/docker-compose.yml --file=build/docker-compose.${{ matrix.version }}.yml --project-directory=. up --exit-code-from=tests --build
 
@@ -172,14 +174,14 @@ jobs:
 
   build-test:
     needs: [
-      lint-misspell-sanitycheck,
       detect-changes,
+      lint-misspell-sanitycheck,
       lint-md,
       lint-dotnet-format,
-      build-test-solution-stable,
-      build-test-solution-experimental,
-      build-test-instrumentation-stable,
-      build-test-instrumentation-experimental,
+      build-test-solution,
+      build-test-project-stable,
+      build-test-project-experimental,
+      build-test-unstable-core,
       otlp-integration-test,
       w3c-trace-context-integration-test,
       validate-packages,
@@ -187,7 +189,8 @@ jobs:
       verify-aot-compat,
       concurrency-tests
       ]
-    if: always() && !cancelled() && !contains(needs.*.result, 'failure')
-    runs-on: windows-latest
+    if: always() && !cancelled()
+    runs-on: ubuntu-22.04
     steps:
-    - run: echo 'build complete'
+    - run: |
+          if ( ${{ contains(needs.*.result, 'failure') }} == true ); then echo 'build failed'; exit 1; else echo 'build complete'; fi

.github/workflows/codeql-analysis.yml

@@ -1,46 +1,71 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
 name: "CodeQL"
 
 on:
+  push:
+    branches: [ 'main' ]
+  pull_request:
+    branches: [ 'main' ]
   schedule:
     - cron: '0 0 * * *' # once in a day at 00:00
   workflow_dispatch:
 
+permissions: {}
+
 jobs:
   analyze:
-    name: Analyze
+    permissions:
+      actions: read  # for github/codeql-action/init to get workflow details
+      contents: read  # for actions/checkout to fetch code
+      security-events: write  # for github/codeql-action/analyze to upload SARIF results
     runs-on: windows-latest
 
     strategy:
       fail-fast: false
       matrix:
-        language: ['csharp']
+        language: ['actions', 'csharp']
 
     steps:
-    - name: configure Pagefile
-      uses: al-cheb/configure-pagefile-action@v1.4
+    - name: Configure Pagefile
+      if: matrix.language == 'csharp'
+      uses: al-cheb/configure-pagefile-action@a3b6ebd6b634da88790d9c58d4b37a7f4a7b8708 # v1.4
       with:
         minimum-size: 8GB
         maximum-size: 32GB
         disk-root: "D:"
 
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        filter: 'tree:0'
+        persist-credentials: false
+        show-progress: false
 
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v3
+      uses: github/codeql-action/init@2d92b76c45b91eb80fc44c74ce3fce0ee94e8f9d # v3.30.0
       with:
+        build-mode: none
         languages: ${{ matrix.language }}
 
-    - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
-
-    - name: dotnet pack OpenTelemetry.proj
-      run: dotnet pack OpenTelemetry.proj --configuration Release
-
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v3
+      uses: github/codeql-action/analyze@2d92b76c45b91eb80fc44c74ce3fce0ee94e8f9d # v3.30.0
+      with:
+        category: '/language:${{ matrix.language }}'
+
+  codeql:
+    if: ${{ !cancelled() }}
+    needs: [ analyze ]
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Report status
+      shell: bash
+      env:
+        SCAN_SUCCESS: ${{ !contains(needs.*.result, 'failure') && !contains(needs.*.result, 'cancelled') }}
+      run: |
+        if [ "${SCAN_SUCCESS}" == "true" ]
+        then
+          echo 'CodeQL analysis successful'
+        else
+          echo 'CodeQL analysis failed'
+          exit 1
+        fi

.github/workflows/concurrency-tests.yml

@@ -5,30 +5,33 @@ name: Concurrency Tests
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   run-concurrency-tests:
 
     strategy:
       fail-fast: false  # ensures the entire test matrix is run, even if one permutation fails
       matrix:
-        os: [ windows-latest, ubuntu-latest ]
+        os: [ windows-latest, ubuntu-22.04 ]
         version: [ net8.0 ]
         project: [ OpenTelemetry.Tests, OpenTelemetry.Api.Tests ]
 
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
     - name: Run Coyote Tests
       shell: pwsh
-      run: .\build\test-threadSafety.ps1 -testProjectName ${{ matrix.project }} -targetFramework ${{ matrix.version }}
+      run: .\build\scripts\test-threadSafety.ps1 -testProjectName ${{ matrix.project }} -targetFramework ${{ matrix.version }}
 
     - name: Publish Artifacts
       if: always() && !cancelled()
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
       with:
         name: ${{ matrix.os }}-${{ matrix.project }}-${{ matrix.version }}-coyoteoutput
         path: '**/*_CoyoteOutput.*'

.github/workflows/docfx.yml

@@ -5,16 +5,22 @@ name: Build docfx
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   run-docfx-build:
     runs-on: windows-latest
 
     steps:
     - name: check out code
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
     - name: install docfx
-      run: choco install docfx -y
+      run: dotnet tool install -g docfx
 
     - name: run .\build\docfx.cmd
       shell: cmd

.github/workflows/dotnet-format.yml

@@ -5,22 +5,25 @@ name: Lint - dotnet format
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   run-dotnet-format-stable:
     runs-on: windows-latest
 
     steps:
     - name: check out code
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
     - name: dotnet restore
-      run: dotnet restore
+      run: dotnet restore OpenTelemetry.sln
 
     - name: dotnet format
-      run: dotnet format OpenTelemetry.sln --no-restore --verify-no-changes
+      run: dotnet format OpenTelemetry.sln --no-restore --verify-no-changes # Note: .proj files are currently not supported by dotnet format
       env:
         ExposeExperimentalFeatures: false
 
@@ -29,15 +32,15 @@ jobs:
 
     steps:
     - name: check out code
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
     - name: dotnet restore
-      run: dotnet restore
+      run: dotnet restore OpenTelemetry.sln
 
     - name: dotnet format
-      run: dotnet format OpenTelemetry.sln --no-restore --verify-no-changes
+      run: dotnet format OpenTelemetry.sln --no-restore --verify-no-changes # Note: .proj files are currently not supported by dotnet format
       env:
         ExposeExperimentalFeatures: true

.github/workflows/fossa.yml

@@ -0,0 +1,20 @@
+name: FOSSA scanning
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  fossa:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+      - uses: fossas/fossa-action@3ebcea1862c6ffbd5cf1b4d0bd6b3fe7bd6f2cac # v1.7.0
+        with:
+          api-key: ${{secrets.FOSSA_API_KEY}}
+          team: OpenTelemetry

.github/workflows/markdownlint.yml

@@ -5,16 +5,19 @@ name: Lint - Markdown
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   run-markdownlint:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
     - name: check out code
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - name: run markdownlint
-      uses: DavidAnson/markdownlint-cli2-action@v16.0.0
+      uses: DavidAnson/markdownlint-cli2-action@992badcdf24e3b8eb7e87ff9287fe931bcb00c6e # v20.0.0
       with:
         globs: |
           **/*.md

.github/workflows/ossf-scorecard.yml

@@ -0,0 +1,47 @@
+name: OSSF Scorecard
+
+on:
+  push:
+    branches:
+      - main
+  schedule:
+    - cron: "24 5 * * 0" # once a week
+  workflow_dispatch:
+
+permissions: read-all
+
+jobs:
+  analysis:
+    runs-on: ubuntu-latest
+    permissions:
+      # Needed for Code scanning upload
+      security-events: write
+      # Needed for GitHub OIDC token if publish_results is true
+      id-token: write
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+
+      - uses: ossf/scorecard-action@05b42c624433fc40578a4040d5cf5e36ddca8cde # v2.4.2
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true
+
+      # Upload the results as artifacts (optional). Commenting out will disable
+      # uploads of run results in SARIF format to the repository Actions tab.
+      # https://docs.github.com/en/actions/advanced-guides/storing-workflow-data-as-artifacts
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard (optional).
+      # Commenting out will disable upload of results to your repo's Code Scanning dashboard
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@2d92b76c45b91eb80fc44c74ce3fce0ee94e8f9d # v3.30.0
+        with:
+          sarif_file: results.sarif

.github/workflows/package-validation.yml

@@ -5,12 +5,15 @@ name: Package Validation
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   run-package-validation-stable:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       with:
         # Note: By default GitHub only fetches 1 commit. MinVer needs to find
         # the version tag which is typically NOT on the first commit so we
@@ -18,16 +21,23 @@ jobs:
         fetch-depth: 0
 
     - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
-    - name: Pack
-      run: dotnet pack OpenTelemetry.proj --configuration Release /p:EnablePackageValidation=true /p:ExposeExperimentalFeatures=false
+    - name: dotnet pack
+      run: dotnet pack ./build/OpenTelemetry.proj --configuration Release /p:EnablePackageValidation=true /p:ExposeExperimentalFeatures=false /p:RunningDotNetPack=true
+
+    - name: Publish stable NuGet packages to Artifacts
+      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+      with:
+        name: packages-stable
+        path: ./artifacts/package/release
+        if-no-files-found: error
 
   run-package-validation-experimental:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       with:
         # Note: By default GitHub only fetches 1 commit. MinVer needs to find
         # the version tag which is typically NOT on the first commit so we
@@ -35,7 +45,14 @@ jobs:
         fetch-depth: 0
 
     - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
-    - name: Pack
-      run: dotnet pack OpenTelemetry.proj --configuration Release /p:EnablePackageValidation=true /p:ExposeExperimentalFeatures=true
+    - name: dotnet pack
+      run: dotnet pack ./build/OpenTelemetry.proj --configuration Release /p:EnablePackageValidation=true /p:ExposeExperimentalFeatures=true /p:RunningDotNetPack=true
+
+    - name: Publish experimental NuGet packages to Artifacts
+      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+      with:
+        name: packages-experimental
+        path: ./artifacts/package/release
+        if-no-files-found: error

.github/workflows/post-release.yml

@@ -0,0 +1,125 @@
+name: Complete release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        required: true
+        description: 'Release tag'
+        type: string
+
+  release:
+    types:
+    - published
+
+  issue_comment:
+    types:
+    - created
+
+permissions:
+  contents: read
+
+jobs:
+  automation:
+    uses: ./.github/workflows/automation.yml
+    secrets: inherit
+
+  push-packages-and-publish-release:
+    runs-on: ubuntu-22.04
+
+    needs: automation
+
+    if: |
+      github.event_name == 'issue_comment'
+      && github.event.issue.pull_request
+      && github.event.issue.locked == true
+      && github.event.comment.user.login != needs.automation.outputs.username
+      && contains(github.event.comment.body, '/PushPackages')
+      && startsWith(github.event.issue.title, '[release] Prepare release ')
+      && github.event.issue.pull_request.merged_at
+      && needs.automation.outputs.enabled
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - name: check out code
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+        ref: ${{ github.event.repository.default_branch }}
+
+    - name: Push packages and publish release
+      shell: pwsh
+      env:
+        NUGET_TOKEN: ${{ secrets.NUGET_TOKEN }}
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        PushPackagesPublishReleaseUnlockAndPostNoticeOnPrepareReleasePullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -pullRequestNumber '${{ github.event.issue.number }}' `
+          -botUserName '${{ needs.automation.outputs.username }}' `
+          -commentUserName '${{ github.event.comment.user.login }}' `
+          -artifactDownloadPath '${{ github.workspace }}/artifacts' `
+          -pushToNuget '${{ secrets.NUGET_TOKEN != '' }}'
+
+  post-release-published:
+    runs-on: ubuntu-22.04
+
+    needs:
+    - automation
+
+    if: |
+      needs.automation.outputs.enabled
+      && (github.event_name == 'release' || github.event_name == 'workflow_dispatch')
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        # Note: By default GitHub only fetches 1 commit. We need all the tags
+        # for this work.
+        fetch-depth: 0
+        ref: ${{ github.event.repository.default_branch }}
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
+
+    - name: Create GitHub Pull Request to update stable build version in props
+      if: |
+          (github.ref_type == 'tag' && startsWith(github.ref_name, 'core-') && !contains(github.ref_name, '-alpha') && !contains(github.ref_name, '-beta') && !contains(github.ref_name, '-rc'))
+          || (inputs.tag && startsWith(inputs.tag, 'core-') && !contains(inputs.tag, '-alpha') && !contains(inputs.tag, '-beta') && !contains(inputs.tag, '-rc'))
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        CreateStableVersionUpdatePullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -tag '${{ inputs.tag || github.ref_name }}' `
+          -targetBranch '${{ github.event.repository.default_branch }}' `
+          -gitUserName '${{ needs.automation.outputs.username }}' `
+          -gitUserEmail '${{ needs.automation.outputs.email }}'
+
+    - name: Invoke core version update workflow in opentelemetry-dotnet-contrib repository
+      if: vars.CONTRIB_REPO
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        InvokeCoreVersionUpdateWorkflowInRemoteRepository `
+          -remoteGitRepository '${{ vars.CONTRIB_REPO }}' `
+          -tag '${{ inputs.tag || github.ref_name }}'
+
+    - name: Post notice when release is published
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        TryPostReleasePublishedNoticeOnPrepareReleasePullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -botUserName '${{ needs.automation.outputs.username }}' `
+          -tag '${{ inputs.tag || github.ref_name }}'

.github/workflows/prepare-release.yml

@@ -0,0 +1,214 @@
+name: Prepare for a release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag-prefix:
+        type: choice
+        options:
+        - core-
+        - coreunstable-
+        description: 'Release tag prefix'
+        required: true
+      version:
+        type: string
+        description: 'Release version'
+        required: true
+
+  pull_request:
+    types:
+    - closed
+
+  issue_comment:
+    types:
+    - created
+
+permissions:
+  contents: read
+
+jobs:
+  automation:
+    uses: ./.github/workflows/automation.yml
+    secrets: inherit
+
+  prepare-release-pr:
+    runs-on: ubuntu-22.04
+
+    needs: automation
+
+    if: github.event_name == 'workflow_dispatch' && needs.automation.outputs.enabled
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - name: check out code
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    - name: Create GitHub Pull Request to prepare release
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\prepare-release.psm1
+
+        CreatePullRequestToUpdateChangelogsAndPublicApis `
+          -gitRepository '${{ github.repository }}' `
+          -minVerTagPrefix '${{ inputs.tag-prefix }}' `
+          -version '${{ inputs.version }}' `
+          -requestedByUserName '${{ github.event.sender.login }}' `
+          -targetBranch '${{ github.ref_name }}' `
+          -gitUserName '${{ needs.automation.outputs.username }}' `
+          -gitUserEmail '${{ needs.automation.outputs.email }}'
+
+  lock-pr-and-post-notice-to-create-release-tag:
+    runs-on: ubuntu-22.04
+
+    needs: automation
+
+    if: |
+      github.event_name == 'pull_request'
+      && github.event.action == 'closed'
+      && github.event.pull_request.user.login == needs.automation.outputs.username
+      && github.event.pull_request.merged == true
+      && startsWith(github.event.pull_request.title, '[release] Prepare release ')
+      && needs.automation.outputs.enabled
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - name: check out code
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    - name: Lock GitHub Pull Request to prepare release
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\prepare-release.psm1
+
+        LockPullRequestAndPostNoticeToCreateReleaseTag `
+          -gitRepository '${{ github.repository }}' `
+          -pullRequestNumber '${{ github.event.pull_request.number }}' `
+          -botUserName '${{ needs.automation.outputs.username }}'
+
+  create-release-tag-pr-post-notice:
+    runs-on: ubuntu-22.04
+
+    needs: automation
+
+    if: |
+      github.event_name == 'issue_comment'
+      && github.event.issue.pull_request
+      && github.event.issue.locked == true
+      && github.event.comment.user.login != needs.automation.outputs.username
+      && contains(github.event.comment.body, '/CreateReleaseTag')
+      && startsWith(github.event.issue.title, '[release] Prepare release ')
+      && github.event.issue.pull_request.merged_at
+      && needs.automation.outputs.enabled
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - name: check out code
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        # Note: By default GitHub only fetches 1 commit which fails the git tag operation below
+        fetch-depth: 0
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    - name: Create release tag
+      id: create-tag
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\prepare-release.psm1
+
+        CreateReleaseTagAndPostNoticeOnPullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -pullRequestNumber '${{ github.event.issue.number }}' `
+          -botUserName '${{ needs.automation.outputs.username }}' `
+          -gitUserName '${{ needs.automation.outputs.username }}' `
+          -gitUserEmail '${{ needs.automation.outputs.email }}'
+
+  update-changelog-release-dates-on-prepare-pr-post-notice:
+    runs-on: ubuntu-22.04
+
+    needs: automation
+
+    if: |
+      github.event_name == 'issue_comment'
+      && github.event.issue.pull_request
+      && github.event.issue.state == 'open'
+      && github.event.comment.user.login != needs.automation.outputs.username
+      && contains(github.event.comment.body, '/UpdateReleaseDates')
+      && startsWith(github.event.issue.title, '[release] Prepare release ')
+      && github.event.issue.pull_request.merged_at == null
+      && needs.automation.outputs.enabled
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - name: check out code
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        # Note: By default GitHub only fetches 1 commit which fails the git tag operation below
+        fetch-depth: 0
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    - name: Update release date
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\prepare-release.psm1
+
+        UpdateChangelogReleaseDatesAndPostNoticeOnPullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -pullRequestNumber '${{ github.event.issue.number }}' `
+          -botUserName '${{ needs.automation.outputs.username }}' `
+          -commentUserName '${{ github.event.comment.user.login }}' `
+          -gitUserName '${{ needs.automation.outputs.username }}' `
+          -gitUserEmail '${{ needs.automation.outputs.email }}'
+
+  update-releasenotes-on-prepare-pr-post-notice:
+    runs-on: ubuntu-22.04
+
+    needs: automation
+
+    if: |
+      github.event_name == 'issue_comment'
+      && github.event.issue.pull_request
+      && github.event.issue.state == 'open'
+      && github.event.comment.user.login != needs.automation.outputs.username
+      && contains(github.event.comment.body, '/UpdateReleaseNotes')
+      && startsWith(github.event.issue.title, '[release] Prepare release ')
+      && github.event.issue.pull_request.merged_at == null
+      && needs.automation.outputs.enabled
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - name: check out code
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        # Note: By default GitHub only fetches 1 commit which fails the git tag operation below
+        fetch-depth: 0
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    - name: Update release notes
+      env:
+        COMMENT_BODY: ${{ github.event.comment.body }}
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\prepare-release.psm1
+
+        UpdateReleaseNotesAndPostNoticeOnPullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -pullRequestNumber '${{ github.event.issue.number }}' `
+          -botUserName '${{ needs.automation.outputs.username }}' `
+          -commentUserName '${{ github.event.comment.user.login }}' `
+          -commentBody $Env:COMMENT_BODY `
+          -gitUserName '${{ needs.automation.outputs.username }}' `
+          -gitUserEmail '${{ needs.automation.outputs.email }}'

.github/workflows/publish-packages-1.0.yml

@@ -8,43 +8,140 @@
 name: Build, pack, and publish to MyGet
 
 on:
-  release:
-    types: [published]
+  workflow_dispatch:
+  push:
+    tags:
+      - 'core-*'
+      - 'coreunstable-*'
   schedule:
     - cron: '0 0 * * *' # once in a day at 00:00
 
+permissions:
+  contents: read
+
 jobs:
+  automation:
+    uses: ./.github/workflows/automation.yml
+    secrets: inherit
+
   build-pack-publish:
     runs-on: windows-latest
+    permissions:
+      contents: read
+      id-token: write
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      COSIGN_YES: "yes"
+
+    outputs:
+      artifact-url: ${{ steps.upload-artifacts.outputs.artifact-url }}
+      artifact-id: ${{ steps.upload-artifacts.outputs.artifact-id }}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
       with:
         # Note: By default GitHub only fetches 1 commit. MinVer needs to find
         # the version tag which is typically NOT on the first commit so we
         # retrieve them all.
         fetch-depth: 0
-        ref: ${{ github.ref || 'main' }}
 
     - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
+
+    - name: Install Cosign
+      uses: sigstore/cosign-installer@d58896d6a1865668819e1d91763c7751a165e159 # v3.9.2
+      with:
+        cosign-release: v2.5.3
 
     - name: dotnet restore
-      run: dotnet restore OpenTelemetry.proj -p:RunningDotNetPack=true
+      run: dotnet restore ./build/OpenTelemetry.proj -p:RunningDotNetPack=true
 
     - name: dotnet build
-      run: dotnet build OpenTelemetry.proj --configuration Release --no-restore -p:Deterministic=true -p:BuildNumber=${{ github.run_number }} -p:RunningDotNetPack=true
+      run: dotnet build ./build/OpenTelemetry.proj --configuration Release --no-restore -p:Deterministic=true -p:BuildNumber=${{ github.run_number }} -p:RunningDotNetPack=true
+
+    - name: Sign DLLs with Cosign Keyless
+      shell: pwsh
+      run: |
+        $projectFiles = Get-ChildItem -Path src/*/*.csproj -File
+
+        foreach ($projectFile in $projectFiles) {
+            $projectName = [System.IO.Path]::GetFileNameWithoutExtension($projectFile)
+
+            Get-ChildItem -Path artifacts/bin/$projectName/release_*/$projectName.dll -File | ForEach-Object {
+                $fileFullPath = $_.FullName
+                Write-Host "Signing $fileFullPath"
+
+                cosign.exe sign-blob $fileFullPath --yes --output-signature $fileFullPath-keyless.sig --output-certificate $fileFullPath-keyless.pem
+            }
+        }
 
     - name: dotnet pack
-      run: dotnet pack OpenTelemetry.proj --configuration Release --no-restore --no-build
+      run: dotnet pack ./build/OpenTelemetry.proj --configuration Release --no-restore --no-build -p:PackTag=${{ github.ref_type == 'tag' && github.ref_name || '' }}
 
     - name: Publish Artifacts
-      uses: actions/upload-artifact@v4
+      id: upload-artifacts
+      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
       with:
         name: ${{ github.ref_name }}-packages
-        path: '**/bin/**/*.*nupkg'
+        path: ./artifacts/package/release
+        if-no-files-found: error
 
     - name: Publish MyGet
+      env:
+        MYGET_TOKEN_EXISTS: ${{ secrets.MYGET_TOKEN != '' }}
+      if: env.MYGET_TOKEN_EXISTS == 'true' # Skip MyGet publish if run on a fork without the secret
       run: |
         nuget setApiKey ${{ secrets.MYGET_TOKEN }} -Source https://www.myget.org/F/opentelemetry/api/v2/package
-        nuget push **/bin/**/*.nupkg -Source https://www.myget.org/F/opentelemetry/api/v2/package
+        nuget push ./artifacts/package/release/*.nupkg -Source https://www.myget.org/F/opentelemetry/api/v2/package
+
+  post-build:
+    runs-on: ubuntu-22.04
+
+    needs:
+    - automation
+    - build-pack-publish
+
+    if: needs.automation.outputs.enabled && github.event_name == 'push'
+
+    env:
+      GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    steps:
+    - name: check out code
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      with:
+        token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
+
+    - name: Download Artifacts
+      run: |
+        curl \
+          -H "Accept: application/vnd.github+json" \
+          -H "Authorization: token ${{ github.token }}" \
+          -L \
+          -o '${{ github.workspace }}/artifacts/${{ github.ref_name }}-packages.zip' \
+          --create-dirs \
+          "https://api.github.com/repos/${{ github.repository }}/actions/artifacts/${{ needs.build-pack-publish.outputs.artifact-id }}/zip"
+
+    - name: Create GitHub Release draft
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        CreateDraftRelease `
+          -gitRepository '${{ github.repository }}' `
+          -tag '${{ github.ref_name }}' `
+          -releaseFiles '${{ github.workspace }}/artifacts/${{ github.ref_name }}-packages.zip#Packages'
+
+    - name: Post notice when packages are ready
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        TryPostPackagesReadyNoticeOnPrepareReleasePullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -tag '${{ github.ref_name }}' `
+          -tagSha '${{ github.sha }}' `
+          -packagesUrl '${{ needs.build-pack-publish.outputs.artifact-url }}' `
+          -botUserName '${{ needs.automation.outputs.username }}'
+
+

.github/workflows/sanitycheck.yml

@@ -5,13 +5,16 @@ name: Lint - Spelling & Encoding
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   run-misspell:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
     - name: check out code
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - name: install misspell
       run: |
@@ -22,11 +25,11 @@ jobs:
       run: ./bin/misspell -error .
 
   run-sanitycheck:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
     - name: check out code
-      uses: actions/checkout@v4
+      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - name: detect non-ASCII encoding and trailing space
-      run: python3 ./build/sanitycheck.py
+      run: python3 ./build/scripts/sanitycheck.py

.github/workflows/stale.yml

@@ -1,21 +1,32 @@
 # Syntax: https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions
 # Github Actions Stale: https://github.com/actions/stale
 
-name: "Close stale pull requests"
+name: "Manage stale issues and pull requests"
 on:
   schedule:
     - cron: "12 3 * * *"  # arbitrary time not to DDOS GitHub
 
+permissions:
+  contents: read
+
 jobs:
   stale:
-    runs-on: ubuntu-latest
+    permissions:
+      issues: write  # for actions/stale to close stale issues
+      pull-requests: write  # for actions/stale to close stale PRs
+    runs-on: ubuntu-22.04
     steps:
-      - uses: actions/stale@v9
+      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639 # v9.1.0
         with:
-          stale-pr-message: 'This PR was marked stale due to lack of activity and will be closed in 7 days. Commenting or Pushing will instruct the bot to automatically remove the label. This bot runs once per day.'
+          stale-issue-message: 'This issue was marked stale due to lack of activity and will be closed in 7 days. Commenting will instruct the bot to automatically remove the label. This bot runs once per day.'
+          close-issue-message: 'Closed as inactive. Feel free to reopen if this issue is still a concern.'
+          stale-pr-message: 'This PR was marked stale due to lack of activity and will be closed in 7 days. Commenting or pushing will instruct the bot to automatically remove the label. This bot runs once per day.'
           close-pr-message: 'Closed as inactive. Feel free to reopen if this PR is still being worked on.'
           operations-per-run: 400
           days-before-pr-stale: 7
-          days-before-issue-stale: -1
+          days-before-issue-stale: 300
           days-before-pr-close: 7
-          days-before-issue-close: -1
+          days-before-issue-close: 7
+          exempt-all-issue-milestones: true
+          exempt-issue-labels: 'keep-open,needs-triage'
+          exempt-pr-labels: 'keep-open'

.github/workflows/verifyaotcompat.yml

@@ -5,22 +5,25 @@ name: Publish & Verify AOT Compatibility
 on:
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
   run-verify-aot-compat:
 
     strategy:
       fail-fast: false # ensures the entire test matrix is run, even if one permutation fails
       matrix:
-        os: [ ubuntu-latest, windows-latest ]
-        version: [ net8.0 ]
+        os: [ ubuntu-22.04, windows-latest ]
+        version: [ net8.0, net9.0 ]
 
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
     - name: Setup dotnet
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
 
     - name: publish AOT testApp, assert static analysis warning count, and run the app
       shell: pwsh
-      run: .\build\test-aot-compatibility.ps1 ${{ matrix.version }}
+      run: .\build\scripts\test-aot-compatibility.ps1 ${{ matrix.version }}

.gitignore

@@ -21,6 +21,7 @@
 x64/
 x86/
 bld/
+[Aa]rtifacts/
 [Bb]in/
 [Oo]bj/
 [Ll]og/
@@ -351,3 +352,6 @@ tempo-data/
 
 # Coyote Rewrite Files
 rewrite.coyote.json
+
+# Test results
+TestResults/

.markdownlint.yaml

@@ -1,7 +1,15 @@
 # Default state for all rules
 default: true
 
-# allow long lines for tables and code blocks
+# MD013/line-length : Line length : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md013.md
 MD013:
   code_blocks: false
   tables: false
+
+# MD033/no-inline-html : Inline HTML : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md033.md
+MD033:
+  # Allowed elements
+  allowed_elements: [ 'details', 'summary' ]
+
+# MD059/link-text-should-be-descriptive : Inline HTML : https://github.com/DavidAnson/markdownlint/blob/v0.38.0/doc/md059.md
+MD059: false

CONTRIBUTING.md

@@ -10,16 +10,39 @@ for a summary description of past meetings. To request edit access, join the
 meeting or get in touch on
 [Slack](https://cloud-native.slack.com/archives/C01N3BC2W7Q).
 
-Even though, anybody can contribute, there are benefits of being a member of our
-community. See to the [community membership
+Anyone may contribute but there are benefits of being a member of our community.
+See the [community membership
 document](https://github.com/open-telemetry/community/blob/main/community-membership.md)
 on how to become a
-[**Member**](https://github.com/open-telemetry/community/blob/main/community-membership.md#member),
-[**Approver**](https://github.com/open-telemetry/community/blob/main/community-membership.md#approver)
+[**Member**](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#member),
+[**Triager**](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#triager),
+[**Approver**](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#approver),
 and
-[**Maintainer**](https://github.com/open-telemetry/community/blob/main/community-membership.md#maintainer).
+[**Maintainer**](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#maintainer).
 
-## Find a Buddy and Get Started Quickly
+## Give feedback
+
+We are always looking for your feedback.
+
+You can do this by [submitting a GitHub issue](https://github.com/open-telemetry/opentelemetry-dotnet/issues/new).
+
+You may also prefer writing on [#otel-dotnet Slack channel](https://cloud-native.slack.com/archives/C01N3BC2W7Q).
+
+### Report a bug
+
+Reporting bugs is an important contribution. Please make sure to include:
+
+* Expected and actual behavior;
+* OpenTelemetry, OS, and .NET versions you are using;
+* Steps to reproduce;
+* [Minimal, reproducible example](https://stackoverflow.com/help/minimal-reproducible-example).
+
+### Request a feature
+
+If you would like to work on something that is not listed as an issue
+(e.g. a new feature or enhancement) please create an issue and describe your proposal.
+
+## Find a buddy and get started quickly
 
 If you are looking for someone to help you find a starting point and be a
 resource for your first contribution, join our Slack channel and find a buddy!
@@ -34,17 +57,24 @@ resource for your first contribution, join our Slack channel and find a buddy!
 
 Your OpenTelemetry buddy is your resource to talk to directly on all aspects of
 contributing to OpenTelemetry: providing context, reviewing PRs, and helping
-those get merged. Buddies will not be available 24/7, but is committed to
-responding during their normal contribution hours.
+those get merged. Buddies will not be available 24/7, but are committed to
+responding during their normal working hours.
 
 ## Development Environment
 
-You can contribute to this project from a Windows, macOS or Linux machine.
+You can contribute to this project from a Windows, macOS, or Linux machine.
 
 On all platforms, the minimum requirements are:
 
-* Git client and command line tools.
-* .NET 8.0
+* Git client and command line tools
+
+* [.NET SDK (latest stable version)](https://dotnet.microsoft.com/download)
+
+  > [!NOTE]
+  > At times a pre-release version of the .NET SDK may be required to build code
+    in this repository. Check
+    [global.json](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/global.json)
+    to verify the current required version.
 
 ### Linux or MacOS
 
@@ -59,42 +89,97 @@ of Windows.
 * Visual Studio 2022+ or Visual Studio Code
 * .NET Framework 4.6.2+
 
-### Public API
+## Public API validation
 
-It is critical to keep public API surface small and clean. This repository is
-using `Microsoft.CodeAnalysis.PublicApiAnalyzers` to validate the public APIs.
-This analyzer will check if you changed a public property/method so the change
-will be easily spotted in pull request. It will also ensure that OpenTelemetry
-doesn't expose APIs outside of the library primary concerns like a generic
-helper methods.
+It is critical to **NOT** make breaking changes to public APIs which have been
+released in stable builds. We also strive to keep a minimal public API surface.
+This repository is using
+[Microsoft.CodeAnalysis.PublicApiAnalyzers](https://github.com/dotnet/roslyn-analyzers/blob/main/src/PublicApiAnalyzers/PublicApiAnalyzers.Help.md)
+and [Package
+validation](https://learn.microsoft.com/dotnet/fundamentals/apicompat/package-validation/overview)
+to validate public APIs.
 
-#### How to enable and configure
+* `Microsoft.CodeAnalysis.PublicApiAnalyzers` will validate public API
+  changes/additions against a set of "public API files" which capture the
+  shipped/unshipped public APIs. These files must be maintained manually (not
+  recommended) or by using tooling/code fixes built into the package (see below
+  for details).
 
-* Create a folder in your project called `.publicApi` with the frameworks that
-  as folders you target.
-* Create two files called `PublicAPI.Shipped.txt` and `PublicAPI.Unshipped.txt`
-   in each framework that you target.
-* Add the following lines to your csproj:
+  Public API files are also used to perform public API reviews by repo
+  approvers/maintainers before releasing stable builds.
 
-```xml
-<ItemGroup>
-  <AdditionalFiles Include=".publicApi\$(TargetFramework)\PublicAPI.Shipped.txt" />
-  <AdditionalFiles Include=".publicApi\$(TargetFramework)\PublicAPI.Unshipped.txt" />
-</ItemGroup>
-```
+* `Package validation` will validate public API changes/additions against
+  previously released NuGet packages.
 
-* Use
-   [IntelliSense](https://docs.microsoft.com/visualstudio/ide/using-intellisense)
-   to update the publicApi files.
+  This is performed automatically by the build/CI
+  [package-validation](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/.github/workflows/package-validation.yml)
+  workflow.
+
+  By default package validation is **NOT** run for local builds. To enable
+  package validation in local builds set the `EnablePackageValidation` property
+  to `true` in
+  [Common.prod.props](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/build/Common.prod.props)
+  (please do not check in this change).
+
+### Working with Microsoft.CodeAnalysis.PublicApiAnalyzers
+
+#### Update public API files when writing code
+
+[IntelliSense](https://docs.microsoft.com/visualstudio/ide/using-intellisense)
+will [suggest
+modifications](https://github.com/dotnet/roslyn-analyzers/issues/3322#issuecomment-591031429)
+to the `PublicAPI.Unshipped.txt` file when you make changes. After reviewing
+these changes, ensure they are reflected across all targeted frameworks. You can
+do this by:
+
+* Using the "Fix all occurrences in Project" feature in Visual Studio.
+
+* Manually cycling through each framework using Visual Studio's target framework
+  dropdown (in the upper right corner) and applying the IntelliSense
+  suggestions.
+
+> [!IMPORTANT]
+> Do **NOT** modify `PublicAPI.Shipped.txt` files. New features and bug fixes
+  **SHOULD** only require changes to `PublicAPI.Unshipped.txt` files. If you
+  have to modify a "shipped" file it likely means you made a mistake and broke a
+  stable API. Typically only maintainers modify the `PublicAPI.Shipped.txt` file
+  while performing stable releases. If you need help reach out to an approver or
+  maintainer on Slack or open a draft PR.
+
+#### Enable public API validation in new projects
+
+1. If you are **NOT** using experimental APIs:
+   * If your API is the same across all target frameworks:
+     * You only need two files: `.publicApi/PublicAPI.Shipped.txt` and
+       `.publicApi/PublicAPI.Unshipped.txt`.
+   * If your APIs differ between target frameworks:
+     * Place the shared APIs in `.publicApi/PublicAPI.Shipped.txt` and
+       `.publicApi/PublicAPI.Unshipped.txt`.
+     * Create framework-specific files for API differences (e.g.,
+       `.publicApi/net462/PublicAPI.Shipped.txt` and
+       `.publicApi/net462/PublicAPI.Unshipped.txt`).
+
+2. If you are using experimental APIs:
+   * Follow the rules above, but create an additional layer in your folder
+     structure:
+     * For stable APIs: `.publicApi/Stable/*`.
+     * For experimental APIs: `.publicApi/Experimental/*`.
+   * The `Experimental` folder should contain APIs that are public only in
+     pre-release builds. Typically the `Experimental` folder only contains
+     `PublicAPI.Unshipped.txt` files as experimental APIs are never shipped
+     stable.
+
+    Example folder structure can be found
+    [here](https://github.com/open-telemetry/opentelemetry-dotnet/tree/main/src/OpenTelemetry.Api/.publicApi).
 
 ## Pull Requests
 
-### How to Send Pull Requests
+### How to create pull requests
 
 Everyone is welcome to contribute code to `opentelemetry-dotnet` via GitHub pull
 requests (PRs).
 
-To create a new PR, fork the project in GitHub and clone the upstream repo:
+To create a new PR, fork the project on GitHub and clone the upstream repo:
 
 ```sh
 git clone https://github.com/open-telemetry/opentelemetry-dotnet.git
@@ -125,7 +210,7 @@ If you made changes to the Markdown documents (`*.md` files), install the latest
 markdownlint .
 ```
 
-Check out a new branch, make modifications and push the branch to your fork:
+Check out a new branch, make modifications, and push the branch to your fork:
 
 ```sh
 $ git checkout -b feature
@@ -136,20 +221,26 @@ $ git push fork feature
 
 Open a pull request against the main `opentelemetry-dotnet` repo.
 
-### How to Receive Comments
+#### Tips and best practices for pull requests
 
 * If the PR is not ready for review, please mark it as
   [`draft`](https://github.blog/2019-02-14-introducing-draft-pull-requests/).
 * Make sure CLA is signed and all required CI checks are clear.
-* Submit small, focused PRs addressing a single
-  concern/issue.
+* Submit small, focused PRs addressing a single concern/issue.
 * Make sure the PR title reflects the contribution.
 * Write a summary that helps understand the change.
 * Include usage examples in the summary, where applicable.
 * Include benchmarks (before/after) in the summary, for contributions that are
   performance enhancements.
+* We are open to bot generated PRs or AI/LLM assisted PRs. Actually, we are
+  using
+  [dependabot](https://docs.github.com/en/code-security/dependabot/dependabot-security-updates/configuring-dependabot-security-updates)
+  to automate the security updates. However, if you use bots to generate spam
+  PRs (e.g. incorrect, noisy, non-improvements, unintelligible, trying to sell
+  your product, etc.), we might close the PR right away with a warning, and if
+  you keep doing so, we might block your user account.
 
-### How to Get PRs Merged
+### How to get pull requests merged
 
 A PR is considered to be **ready to merge** when:
 
@@ -157,18 +248,21 @@ A PR is considered to be **ready to merge** when:
   [Approvers](https://github.com/open-telemetry/community/blob/main/community-membership.md#approver).
   /
   [Maintainers](https://github.com/open-telemetry/community/blob/main/community-membership.md#maintainer).
-* Major feedbacks are resolved.
+* Major feedback/comments are resolved.
 * It has been open for review for at least one working day. This gives people
   reasonable time to review.
-* Trivial change (typo, cosmetic, doc, etc.) doesn't have to wait for one day.
-* Urgent fix can take exception as long as it has been actively communicated.
+  * Trivial change (typo, cosmetic, doc, etc.) doesn't have to wait for one day.
+  * Urgent fix can take exception as long as it has been actively communicated.
 
-Any Maintainer can merge the PR once it is **ready to merge**. Note, that some
-PRs may not be merged immediately if the repo is in the process of a release and
-the maintainers decided to defer the PR to the next release train.
+Any maintainer can merge PRs once they are **ready to merge** however
+maintainers might decide to wait on merging changes until there are more
+approvals and/or dicussion, or based on other factors such as release timing and
+risk to users. For example if a stable release is planned and a new change is
+introduced adding public API(s) or behavioral changes it might be held until the
+next alpha/beta release.
 
-If a PR has been stuck (e.g. there are lots of debates and people couldn't agree
-on each other), the owner should try to get people aligned by:
+If a PR has become stuck (e.g. there is a lot of debate and people couldn't
+agree on the direction), the owner should try to get people aligned by:
 
 * Consolidating the perspectives and putting a summary in the PR. It is
   recommended to add a link into the PR description, which points to a comment
@@ -183,7 +277,7 @@ on each other), the owner should try to get people aligned by:
   the owner should bring it to the OpenTelemetry .NET SIG
   [meeting](README.md#contributing).
 
-## Design Choices
+## Design choices
 
 As with other OpenTelemetry clients, opentelemetry-dotnet follows the
 [opentelemetry-specification](https://github.com/open-telemetry/opentelemetry-specification).
@@ -191,7 +285,7 @@ As with other OpenTelemetry clients, opentelemetry-dotnet follows the
 It's especially valuable to read through the [library
 guidelines](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/library-guidelines.md).
 
-### Focus on Capabilities, Not Structure Compliance
+### Focus on capabilities not structural compliance
 
 OpenTelemetry is an evolving specification, one where the desires and use cases
 are clear, but the method to satisfy those uses cases are not.
@@ -205,10 +299,10 @@ than conform to specific API names or argument patterns in the spec.
 For a deeper discussion, see [this spec
 issue](https://github.com/open-telemetry/opentelemetry-specification/issues/165).
 
-## Style Guide
+## Style guide
 
 This project includes a [`.editorconfig`](./.editorconfig) file which is
-supported by all the IDEs/editor mentioned above. It works with the IDE/editor
+supported by all the IDEs/editors mentioned above. It works with the IDE/editor
 only and does not affect the actual build of the project.
 
 This repository also includes StyleCop ruleset files under the `./build` folder.
@@ -229,31 +323,11 @@ types](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-type
 * Pass [static
 analysis](https://learn.microsoft.com/dotnet/fundamentals/code-analysis/overview).
 
-   New projects MUST enable static analysis by specifying
-   `<AnalysisLevel>latest-all</AnalysisLevel>` in the project file (`.csproj`).
-
 > [!NOTE]
 > There are other project-level features enabled automatically via
 [Common.props](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/build/Common.props)
 new projects must NOT manually override these settings.
 
-## New code
-
-New code files MUST enable [nullable reference
-types](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/nullable-reference-types)
-manually in projects where it is not automatically enabled project-wide. This is
-done by specifying `#nullable enable` towards the top of the file (usually after
-the copyright header). We are currently working towards enabling nullable
-context in every project by updating code as it is worked on, this requirement
-is to make sure the surface area of code needing updates is shrinking and not
-expanding.
-
-> [!NOTE]
-> The first time a project is updated to use nullable context in public APIs
-some housekeeping needs to be done in public API definitions (`.publicApi`
-folder). This can be done automatically via a code fix offered by the public API
-analyzer.
-
 ## License requirements
 
 OpenTelemetry .NET is licensed under the [Apache License, Version

Directory.Build.props

@@ -0,0 +1,6 @@
+<Project>
+  <PropertyGroup>
+    <ArtifactsPath>$([System.IO.Path]::Combine('$(MSBuildThisFileDirectory)', 'artifacts'))</ArtifactsPath>
+    <UseArtifactsOutput>true</UseArtifactsOutput>
+  </PropertyGroup>
+</Project>

Directory.Packages.props

@@ -1,7 +1,19 @@
 <Project>
+
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
-    <OTelLatestStableVer>1.8.0</OTelLatestStableVer>
+    <OTelLatestStableVer>1.12.0</OTelLatestStableVer>
+
+    <!--
+        This is typically the latest annual release of .NET. Use this wherever
+        possible and only deviate (use a specific version) when a package has a
+        more specific patch which must be reference directly.
+    -->
+    <LatestRuntimeOutOfBandVer>9.0.0</LatestRuntimeOutOfBandVer>
+
+    <!-- Mitigate https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43485. -->
+    <SystemTextEncodingsWebOutOfBandMinimumCoreAppVer>8.0.0</SystemTextEncodingsWebOutOfBandMinimumCoreAppVer>
+    <SystemTextJsonOutOfBandMinimumCoreAppVer>8.0.5</SystemTextJsonOutOfBandMinimumCoreAppVer>
   </PropertyGroup>
 
   <!--
@@ -10,13 +22,6 @@
       vulnerability in the NuGet packages that are published from this repository.
   -->
   <ItemGroup>
-    <PackageVersion Include="Google.Protobuf" Version="[3.22.5,4.0)" />
-    <PackageVersion Include="Grpc" Version="[2.44.0,3.0)" />
-    <PackageVersion Include="Grpc.Net.Client" Version="[2.52.0,3.0)" />
-    <PackageVersion Include="Microsoft.AspNetCore.Http.Abstractions" Version="[2.1.1,6.0)" />
-    <PackageVersion Include="Microsoft.AspNetCore.Http.Features" Version="[2.1.1,6.0)" />
-    <PackageVersion Include="Microsoft.CSharp" Version="[4.7.0]" />
-
     <!--
         Typically, for the Microsoft.Extensions.* packages relating to DI Abstractions, Hosting Abstractions, and Logging,
         the latest stable version should be used because:
@@ -26,90 +31,98 @@
         3) Since version 3.1.0, the .NET runtime team is holding a high bar for backward compatibility on
           these packages even during major version bumps, so compatibility is not a concern here.
     -->
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="$(LatestRuntimeOutOfBandVer)" />
+    <PackageVersion Include="Microsoft.Extensions.Diagnostics.Abstractions" Version="$(LatestRuntimeOutOfBandVer)" />
+    <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="$(LatestRuntimeOutOfBandVer)" />
+    <PackageVersion Include="Microsoft.Extensions.Logging.Configuration" Version="$(LatestRuntimeOutOfBandVer)" />
 
-    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.1" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Diagnostics.Abstractions" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Logging" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Logging.Configuration" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.Extensions.Options" Version="8.0.0" />
-
-    <PackageVersion Include="OpenTelemetry" Version="$(OTelLatestStableVer)" />
-    <PackageVersion Include="OpenTelemetry.Api" Version="$(OTelLatestStableVer)" />
-    <PackageVersion Include="OpenTelemetry.Api.ProviderBuilderExtensions" Version="$(OTelLatestStableVer)" />
-    <PackageVersion Include="OpenTelemetry.Exporter.InMemory" Version="$(OTelLatestStableVer)" />
-    <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="$(OTelLatestStableVer)" />
-    <PackageVersion Include="OpenTelemetry.Extensions.Propagators" Version="$(OTelLatestStableVer)" />
+    <!--
+        OTel packages always point to latest stable release.
+    -->
+    <PackageVersion Include="OpenTelemetry" Version="[$(OTelLatestStableVer),2.0)" />
+    <PackageVersion Include="OpenTelemetry.Api" Version="[$(OTelLatestStableVer),2.0)" />
+    <PackageVersion Include="OpenTelemetry.Api.ProviderBuilderExtensions" Version="[$(OTelLatestStableVer),2.0)" />
+    <PackageVersion Include="OpenTelemetry.Exporter.InMemory" Version="[$(OTelLatestStableVer),2.0)" />
+    <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="[$(OTelLatestStableVer),2.0)" />
+    <PackageVersion Include="OpenTelemetry.Extensions.Propagators" Version="[$(OTelLatestStableVer),2.0)" />
     <PackageVersion Include="OpenTracing" Version="[0.12.1,0.13)" />
 
     <!--
         Typically, the latest stable version of System.Diagnostics.DiagnosticSource should be used here because:
-        1) Each major version bump will have some new OpenTelemetry API capabilities (e.g. .NET 6 introduced Meter
-          API, .NET 7 added UpDownCounter, .NET 8 is adding Meter/Instrument level attributes support, .NET 9 might
-          add Advice/Hint API) that the OpenTelemetry components rely on.
+        1) Each major version bump will likely have some new OpenTelemetry capabilities (e.g. .NET 6 introduced Meter
+          API, .NET 7 added UpDownCounter, .NET 8 added Meter/Instrument level attributes support, .NET 9 added
+          Advice/Hint API, etc.).
         2) Each minor version bump is normally security hotfixes or critical bug fixes.
         3) The .NET runtime team provides extra backward compatibility guarantee to System.Diagnostics.DiagnosticSource
           even during major version bumps, so compatibility is not a concern here.
     -->
-    <PackageVersion Include="System.Diagnostics.DiagnosticSource" Version="8.0.0" />
+    <PackageVersion Include="System.Diagnostics.DiagnosticSource" Version="$(LatestRuntimeOutOfBandVer)" />
+  </ItemGroup>
 
-    <!-- A conservative version of System.Text.Encodings.Web must be used here since there is no backward compatibility guarantee during major version bumps. -->
+  <ItemGroup>
+    <!--
+        Note: See TargetFrameworksRequiringSystemTextJsonDirectReference for the
+        list of targets where System.Text.Json direct reference is applied.
+    -->
+
+    <!--
+        We use conservative versions of these packages for older runtimes where
+        an upgrade might introduce breaking changes. For example see:
+        https://devblogs.microsoft.com/dotnet/system-text-json-in-dotnet-7/#breaking-changes.
+    -->
     <PackageVersion Include="System.Text.Encodings.Web" Version="4.7.2" />
-
-    <!-- A conservative version of System.Text.Json must be used here since there is no backward compatibility guarantee during major version bumps. -->
     <PackageVersion Include="System.Text.Json" Version="4.7.2" />
 
-    <!-- A conservative version of System.Threading.Tasks.Extensions must be used here since there is no backward compatibility guarantee during major version bumps. -->
-    <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
+    <!-- Newer NETCoreApp runtimes need to be redirected to safe versions. -->
+    <PackageVersion Update="System.Text.Encodings.Web" Version="$(SystemTextEncodingsWebOutOfBandMinimumCoreAppVer)" Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp'" />
+    <PackageVersion Update="System.Text.Json" Version="$(SystemTextJsonOutOfBandMinimumCoreAppVer)" Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp'" />
   </ItemGroup>
 
   <!--
       This section covers packages that are **not** directly referenced by the NuGet packages published from this repository.
-      For example, these packages are used in the tests, examples or referenced as "PrivateAssets", but not in the NuGet packages themselves.
+      These packages are referenced as "PrivateAssets" or used in tests/examples.
   -->
-  <!-- 'net8.0' is the default `TargetFramework`. Use `VersionOverride` in the project to override the package versions from a different `TargetFramework` -->
   <ItemGroup>
-    <PackageVersion Include="BenchmarkDotNet" Version="[0.13.10,0.14)" />
+    <PackageVersion Include="BenchmarkDotNet" Version="0.15.2" />
     <PackageVersion Include="CommandLineParser" Version="[2.9.1,3.0)" />
+    <PackageVersion Include="GitHubActionsTestLogger" Version="2.4.1" />
     <PackageVersion Include="Grpc.AspNetCore" Version="[2.59.0,3.0)" />
     <PackageVersion Include="Grpc.AspNetCore.Server" Version="[2.59.0, 3.0)" />
     <PackageVersion Include="Grpc.Tools" Version="[2.59.0,3.0)" />
+    <PackageVersion Include="Google.Protobuf" Version="[3.22.5,4.0)" />
+    <PackageVersion Include="Grpc" Version="[2.44.0,3.0)" />
+    <PackageVersion Include="Grpc.Net.Client" Version="[2.52.0,3.0)" />
+    <PackageVersion Include="JunitXml.TestLogger" Version="6.1.0" />
+    <PackageVersion Include="Microsoft.CSharp" Version="[4.7.0]" />
     <PackageVersion Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="[3.11.0-beta1.23525.2]" />
-    <PackageVersion Include="Microsoft.Data.SqlClient" Version="5.1.3" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="[8.0.0,)" />
-    <PackageVersion Include="Microsoft.Extensions.Hosting" Version="[8.0.0,)" />
-    <PackageVersion Include="Microsoft.Extensions.Http" Version="[8.0.0,)" />
-    <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="[8.0.0,)" />
-    <PackageVersion Include="Microsoft.Extensions.Telemetry.Abstractions" Version="[8.2.0,)" />
+    <PackageVersion Include="Microsoft.Coyote" Version="1.7.11" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="$(LatestRuntimeOutOfBandVer)" />
+    <PackageVersion Include="Microsoft.Extensions.Hosting" Version="$(LatestRuntimeOutOfBandVer)" />
+    <PackageVersion Include="Microsoft.Extensions.Http" Version="$(LatestRuntimeOutOfBandVer)" />
+    <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="$(LatestRuntimeOutOfBandVer)" />
+    <PackageVersion Include="Microsoft.Extensions.Telemetry.Abstractions" Version="[9.0.0,)" />
     <PackageVersion Include="Microsoft.NETFramework.ReferenceAssemblies" Version="[1.0.3,2.0)" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="[17.8.0,18.0.0)" />
-    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="[1.1.1,2.0)" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="[17.13.0,18.0.0)" />
     <PackageVersion Include="MinVer" Version="[5.0.0,6.0)" />
-    <PackageVersion Include="OpenTelemetry.Instrumentation.Runtime" Version="[1.5.1,2.0)" />
-    <PackageVersion Include="RabbitMQ.Client" Version="[6.6.0,7.0)" />
+    <PackageVersion Include="NuGet.Versioning" Version="6.11.0" />
+    <PackageVersion Include="OpenTelemetry.Instrumentation.AspNetCore" Version="[1.9.0,2.0)" />
+    <PackageVersion Include="OpenTelemetry.Instrumentation.GrpcNetClient" Version="[1.9.0-beta.1,2.0)" />
+    <PackageVersion Include="OpenTelemetry.Instrumentation.Http" Version="[1.9.0,2.0)" />
+    <PackageVersion Include="OpenTelemetry.Instrumentation.Runtime" Version="[1.9.0,2.0)" />
+    <PackageVersion Include="RabbitMQ.Client" Version="[6.8.1,7.0)" />
     <PackageVersion Include="StyleCop.Analyzers" Version="[1.2.0-beta.556,2.0)" />
-    <PackageVersion Include="Swashbuckle.AspNetCore" Version="[6.5.0,)" />
-    <PackageVersion Include="Testcontainers.MsSql" Version="3.6.0" />
-    <PackageVersion Include="Testcontainers.SqlEdge" Version="3.6.0" />
-    <PackageVersion Include="xunit" Version="[2.6.2,3.0)" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="[2.5.4,3.0)" />
+    <PackageVersion Include="Swashbuckle.AspNetCore" Version="[6.7.3,)" />
+    <PackageVersion Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
+    <PackageVersion Include="xunit" Version="[2.9.3,3.0)" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="[2.8.2,3.0)" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="6.0.21" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.21" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="6.0.21" />
-  </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)' == 'net7.0'">
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="7.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="7.0.9" />
-  </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.8" />
   </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="9.0.0" />
+  </ItemGroup>
+
 </Project>

NuGet.config

@@ -3,19 +3,14 @@
   <packageSources>
     <clear />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
-    <add key="dotnet8" value="https://dnceng.pkgs.visualstudio.com/public/_packaging/dotnet8/nuget/v3/index.json" />
   </packageSources>
 
   <!-- Define mappings by adding package patterns beneath the target source. -->
-  <!-- *.Tools packages will be restored from ".Net Core Tools", everything else from nuget.org. -->
   <packageSourceMapping>
     <!-- key value for <packageSource> should match key values from <packageSources> element -->
     <packageSource key="NuGet">
       <package pattern="*" />
     </packageSource>
-    <packageSource key="dotnet8">
-      <package pattern="Microsoft.CodeAnalysis.PublicApiAnalyzers" />
-    </packageSource>
   </packageSourceMapping>
 
   <disabledPackageSources />

OpenTelemetry.sln

@@ -12,13 +12,12 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		.dockerignore = .dockerignore
 		.editorconfig = .editorconfig
 		.gitignore = .gitignore
-		.github\workflows\ci-concurrency.yml = .github\workflows\ci-concurrency.yml
 		CONTRIBUTING.md = CONTRIBUTING.md
 		global.json = global.json
 		LICENSE.TXT = LICENSE.TXT
 		NuGet.config = NuGet.config
-		OpenTelemetry.proj = OpenTelemetry.proj
 		README.md = README.md
+		RELEASENOTES.md = RELEASENOTES.md
 		THIRD-PARTY-NOTICES.TXT = THIRD-PARTY-NOTICES.TXT
 		VERSIONING.md = VERSIONING.md
 	EndProjectSection
@@ -28,23 +27,21 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{7CB2F02E
 		build\Common.nonprod.props = build\Common.nonprod.props
 		build\Common.prod.props = build\Common.prod.props
 		build\Common.props = build\Common.props
+		build\Common.targets = build\Common.targets
 		build\debug.snk = build\debug.snk
 		Directory.Packages.props = Directory.Packages.props
 		build\docfx.cmd = build\docfx.cmd
-		build\docker-compose.net6.0.yml = build\docker-compose.net6.0.yml
-		build\docker-compose.net7.0.yml = build\docker-compose.net7.0.yml
 		build\docker-compose.net8.0.yml = build\docker-compose.net8.0.yml
-		build\finalize-publicapi.ps1 = build\finalize-publicapi.ps1
+		build\docker-compose.net9.0.yml = build\docker-compose.net9.0.yml
 		build\GlobalAttrExclusions.txt = build\GlobalAttrExclusions.txt
 		build\opentelemetry-icon-color.png = build\opentelemetry-icon-color.png
 		build\OpenTelemetry.prod.loose.ruleset = build\OpenTelemetry.prod.loose.ruleset
 		build\OpenTelemetry.prod.ruleset = build\OpenTelemetry.prod.ruleset
+		build\OpenTelemetry.proj = build\OpenTelemetry.proj
 		build\OpenTelemetry.test.ruleset = build\OpenTelemetry.test.ruleset
-		build\process-codecoverage.ps1 = build\process-codecoverage.ps1
 		build\RELEASING.md = build\RELEASING.md
 		build\stylecop.json = build\stylecop.json
-		build\test-aot-compatibility.ps1 = build\test-aot-compatibility.ps1
-		build\test-threadSafety.ps1 = build\test-threadSafety.ps1
+		build\UnstableCoreLibraries.proj = build\UnstableCoreLibraries.proj
 		build\xunit.runner.json = build\xunit.runner.json
 	EndProjectSection
 EndProject
@@ -52,10 +49,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Exporter.Zipk
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Api", "src\OpenTelemetry.Api\OpenTelemetry.Api.csproj", "{99F8A331-05E9-45A5-89BA-4C54E825E5B2}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.AspNetCore", "src\OpenTelemetry.Instrumentation.AspNetCore\OpenTelemetry.Instrumentation.AspNetCore.csproj", "{752D2182-A351-41D8-99EE-DD363D7D5B43}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.AspNetCore.Tests", "test\OpenTelemetry.Instrumentation.AspNetCore.Tests\OpenTelemetry.Instrumentation.AspNetCore.Tests.csproj", "{2A47F6A8-63E5-4237-8046-94CAF321E797}"
-EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "testdata", "testdata", "{77C7929A-2EED-4AA6-8705-B5C443C8AA0F}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "examples", "examples", "{E359BB2B-9AEC-497D-B321-7DF2450C3B8E}"
@@ -80,18 +73,20 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".github", ".github", "{F1D0
 	ProjectSection(SolutionItems) = preProject
 		.github\codecov.yml = .github\codecov.yml
 		.github\CODEOWNERS = .github\CODEOWNERS
+		.github\dependabot.yml = .github\dependabot.yml
 		.github\PULL_REQUEST_TEMPLATE.md = .github\PULL_REQUEST_TEMPLATE.md
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ISSUE_TEMPLATE", "ISSUE_TEMPLATE", "{A533C800-3DC3-4D04-90A7-0CE7A1E6BDB3}"
 	ProjectSection(SolutionItems) = preProject
-		.github\ISSUE_TEMPLATE\bug_report.md = .github\ISSUE_TEMPLATE\bug_report.md
-		.github\ISSUE_TEMPLATE\feature_request.md = .github\ISSUE_TEMPLATE\feature_request.md
-		.github\ISSUE_TEMPLATE\question.md = .github\ISSUE_TEMPLATE\question.md
+		.github\ISSUE_TEMPLATE\bug_report.yml = .github\ISSUE_TEMPLATE\bug_report.yml
+		.github\ISSUE_TEMPLATE\feature_request.yml = .github\ISSUE_TEMPLATE\feature_request.yml
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "workflows", "workflows", "{E69578EB-B456-4062-A645-877CD964528B}"
 	ProjectSection(SolutionItems) = preProject
+		.github\workflows\add-labels.yml = .github\workflows\add-labels.yml
+		.github\workflows\automation.yml = .github\workflows\automation.yml
 		.github\workflows\ci.yml = .github\workflows\ci.yml
 		.github\workflows\codeql-analysis.yml = .github\workflows\codeql-analysis.yml
 		.github\workflows\Component.BuildTest.yml = .github\workflows\Component.BuildTest.yml
@@ -100,6 +95,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "workflows", "workflows", "{
 		.github\workflows\dotnet-format.yml = .github\workflows\dotnet-format.yml
 		.github\workflows\markdownlint.yml = .github\workflows\markdownlint.yml
 		.github\workflows\package-validation.yml = .github\workflows\package-validation.yml
+		.github\workflows\post-release.yml = .github\workflows\post-release.yml
+		.github\workflows\prepare-release.yml = .github\workflows\prepare-release.yml
 		.github\workflows\publish-packages-1.0.yml = .github\workflows\publish-packages-1.0.yml
 		.github\workflows\sanitycheck.yml = .github\workflows\sanitycheck.yml
 		.github\workflows\stale.yml = .github\workflows\stale.yml
@@ -116,36 +113,29 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "test", "test", "{D2E73927-5
 	ProjectSection(SolutionItems) = preProject
 		test\Directory.Build.props = test\Directory.Build.props
 		test\Directory.Build.targets = test\Directory.Build.targets
-		test\Directory.Packages.props = test\Directory.Packages.props
 	EndProjectSection
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.Grpc.Tests", "test\OpenTelemetry.Instrumentation.Grpc.Tests\OpenTelemetry.Instrumentation.Grpc.Tests.csproj", "{305E9DFD-E73B-4A28-8769-795C25551020}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Examples.Console", "examples\Console\Examples.Console.csproj", "{FF3E6E08-E8E4-4523-B526-847CD989279F}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Examples.AspNetCore", "examples\AspNetCore\Examples.AspNetCore.csproj", "{0935622B-9377-4056-8343-AE6ECDC274CF}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Benchmarks", "test\Benchmarks\Benchmarks.csproj", "{DE9130A4-F30A-49D7-8834-41DE3021218B}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.SqlClient.Tests", "test\OpenTelemetry.Instrumentation.SqlClient.Tests\OpenTelemetry.Instrumentation.SqlClient.Tests.csproj", "{0C606039-BE0A-4EE6-B8F7-F75B41E52CB8}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.SqlClient", "src\OpenTelemetry.Instrumentation.SqlClient\OpenTelemetry.Instrumentation.SqlClient.csproj", "{41C30DC1-8C57-4E14-A83A-7635A3C7960B}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.Http.Tests", "test\OpenTelemetry.Instrumentation.Http.Tests\OpenTelemetry.Instrumentation.Http.Tests.csproj", "{DE9EB7D8-9CC5-4073-90B3-9FBF685B3305}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.Http", "src\OpenTelemetry.Instrumentation.Http\OpenTelemetry.Instrumentation.Http.csproj", "{412C64D1-43D6-4E4C-8AD8-E20E63B415BD}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentation.GrpcNetClient", "src\OpenTelemetry.Instrumentation.GrpcNetClient\OpenTelemetry.Instrumentation.GrpcNetClient.csproj", "{0246BFC4-8AAF-45E1-A127-DB43D6E345BB}"
-EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "docs", "docs", "{7C87CAF9-79D7-4C26-9FFB-F3F1FB6911F1}"
+	ProjectSection(SolutionItems) = preProject
+		docs\README.md = docs\README.md
+	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "examples", "examples", "{2C7DD1DA-C229-4D9E-9AF0-BCD5CD3E4948}"
 	ProjectSection(SolutionItems) = preProject
 		examples\Directory.Build.props = examples\Directory.Build.props
-		examples\Directory.Packages.props = examples\Directory.Packages.props
+		examples\Directory.Build.targets = examples\Directory.Build.targets
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "trace", "trace", "{5B7FB835-3FFF-4BC2-99C5-A5B5FAE3C818}"
+	ProjectSection(SolutionItems) = preProject
+		docs\trace\README.md = docs\trace\README.md
+	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "metrics", "metrics", "{3277B1C0-BDFE-4460-9B0D-D9A661FB48DB}"
 	ProjectSection(SolutionItems) = preProject
@@ -210,8 +200,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Tests.Stress"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "getting-started-prometheus-grafana", "docs\metrics\getting-started-prometheus-grafana\getting-started-prometheus-grafana.csproj", "{41B784AA-3301-4126-AF9F-1D59BD04B0BF}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.SemanticConventions", "src\OpenTelemetry.SemanticConventions\OpenTelemetry.SemanticConventions.csproj", "{D4519DF6-CC72-4AC4-A851-E21383098D11}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "customizing-the-sdk", "docs\logs\customizing-the-sdk\customizing-the-sdk.csproj", "{6C7A1595-36D6-4229-BBB5-5A6B5791791D}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Extensions.Propagators", "src\OpenTelemetry.Extensions.Propagators\OpenTelemetry.Extensions.Propagators.csproj", "{E91B2E40-E428-43B3-8A43-09709F0E69E4}"
@@ -261,35 +249,20 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Shared", "Shared", "{A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}"
 	ProjectSection(SolutionItems) = preProject
 		src\Shared\ActivityHelperExtensions.cs = src\Shared\ActivityHelperExtensions.cs
-		src\Shared\ActivityInstrumentationHelper.cs = src\Shared\ActivityInstrumentationHelper.cs
 		src\Shared\AssemblyVersionExtensions.cs = src\Shared\AssemblyVersionExtensions.cs
 		src\Shared\DiagnosticDefinitions.cs = src\Shared\DiagnosticDefinitions.cs
 		src\Shared\ExceptionExtensions.cs = src\Shared\ExceptionExtensions.cs
 		src\Shared\Guard.cs = src\Shared\Guard.cs
 		src\Shared\MathHelper.cs = src\Shared\MathHelper.cs
-		src\Shared\PeerServiceResolver.cs = src\Shared\PeerServiceResolver.cs
 		src\Shared\PeriodicExportingMetricReaderHelper.cs = src\Shared\PeriodicExportingMetricReaderHelper.cs
 		src\Shared\PooledList.cs = src\Shared\PooledList.cs
-		src\Shared\RedactionHelper.cs = src\Shared\RedactionHelper.cs
-		src\Shared\RequestMethodHelper.cs = src\Shared\RequestMethodHelper.cs
 		src\Shared\ResourceSemanticConventions.cs = src\Shared\ResourceSemanticConventions.cs
 		src\Shared\SemanticConventions.cs = src\Shared\SemanticConventions.cs
 		src\Shared\SpanAttributeConstants.cs = src\Shared\SpanAttributeConstants.cs
-		src\Shared\SpanHelper.cs = src\Shared\SpanHelper.cs
 		src\Shared\StatusHelper.cs = src\Shared\StatusHelper.cs
-		src\Shared\TagTransformer.cs = src\Shared\TagTransformer.cs
-		src\Shared\TagTransformerJsonHelper.cs = src\Shared\TagTransformerJsonHelper.cs
 		src\Shared\ThreadSafeRandom.cs = src\Shared\ThreadSafeRandom.cs
 	EndProjectSection
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "DiagnosticSourceInstrumentation", "DiagnosticSourceInstrumentation", "{28F3EC79-660C-4659-8B73-F90DC1173316}"
-	ProjectSection(SolutionItems) = preProject
-		src\Shared\DiagnosticSourceInstrumentation\DiagnosticSourceListener.cs = src\Shared\DiagnosticSourceInstrumentation\DiagnosticSourceListener.cs
-		src\Shared\DiagnosticSourceInstrumentation\DiagnosticSourceSubscriber.cs = src\Shared\DiagnosticSourceInstrumentation\DiagnosticSourceSubscriber.cs
-		src\Shared\DiagnosticSourceInstrumentation\ListenerHandler.cs = src\Shared\DiagnosticSourceInstrumentation\ListenerHandler.cs
-		src\Shared\DiagnosticSourceInstrumentation\PropertyFetcher.cs = src\Shared\DiagnosticSourceInstrumentation\PropertyFetcher.cs
-	EndProjectSection
-EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "EnvironmentVariables", "EnvironmentVariables", "{6D4B4FB2-0A8A-4044-948B-C063FD340439}"
 	ProjectSection(SolutionItems) = preProject
 		src\Shared\EnvironmentVariables\EnvironmentVariablesConfigurationProvider.cs = src\Shared\EnvironmentVariables\EnvironmentVariablesConfigurationProvider.cs
@@ -307,6 +280,7 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Shims", "Shims", "{A0CB9A10-F22D-4E66-A449-74B3D0361A9C}"
 	ProjectSection(SolutionItems) = preProject
 		src\Shared\Shims\IsExternalInit.cs = src\Shared\Shims\IsExternalInit.cs
+		src\Shared\Shims\Lock.cs = src\Shared\Shims\Lock.cs
 		src\Shared\Shims\NullableAttributes.cs = src\Shared\Shims\NullableAttributes.cs
 	EndProjectSection
 EndProject
@@ -330,8 +304,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "experimental-apis", "experi
 	ProjectSection(SolutionItems) = preProject
 		docs\diagnostics\experimental-apis\OTEL1000.md = docs\diagnostics\experimental-apis\OTEL1000.md
 		docs\diagnostics\experimental-apis\OTEL1001.md = docs\diagnostics\experimental-apis\OTEL1001.md
-		docs\diagnostics\experimental-apis\OTEL1002.md = docs\diagnostics\experimental-apis\OTEL1002.md
-		docs\diagnostics\experimental-apis\OTEL1003.md = docs\diagnostics\experimental-apis\OTEL1003.md
+		docs\diagnostics\experimental-apis\OTEL1004.md = docs\diagnostics\experimental-apis\OTEL1004.md
 		docs\diagnostics\experimental-apis\README.md = docs\diagnostics\experimental-apis\README.md
 	EndProjectSection
 EndProject
@@ -357,6 +330,25 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "TagWriter", "TagWriter", "{
 		src\Shared\TagWriter\TagWriter.cs = src\Shared\TagWriter\TagWriter.cs
 	EndProjectSection
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "scripts", "scripts", "{44982E0D-C8C6-42DC-9F8F-714981F27CE6}"
+	ProjectSection(SolutionItems) = preProject
+		build\scripts\add-labels.psm1 = build\scripts\add-labels.psm1
+		build\scripts\finalize-publicapi.ps1 = build\scripts\finalize-publicapi.ps1
+		build\scripts\post-release.psm1 = build\scripts\post-release.psm1
+		build\scripts\prepare-release.psm1 = build\scripts\prepare-release.psm1
+		build\scripts\sanitycheck.py = build\scripts\sanitycheck.py
+		build\scripts\test-aot-compatibility.ps1 = build\scripts\test-aot-compatibility.ps1
+		build\scripts\test-threadSafety.ps1 = build\scripts\test-threadSafety.ps1
+		build\scripts\update-changelogs.ps1 = build\scripts\update-changelogs.ps1
+	EndProjectSection
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "exemplars", "docs\metrics\exemplars\exemplars.csproj", "{79C12C80-B27B-41FB-AE79-A3BB74CFA782}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Proto", "Proto", "{02EA681E-C7D8-13C7-8484-4AC65E1B71E8}"
+	ProjectSection(SolutionItems) = preProject
+		src\Shared\Proto\README.md = src\Shared\Proto\README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -379,14 +371,6 @@ Global
 		{99F8A331-05E9-45A5-89BA-4C54E825E5B2}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{99F8A331-05E9-45A5-89BA-4C54E825E5B2}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{99F8A331-05E9-45A5-89BA-4C54E825E5B2}.Release|Any CPU.Build.0 = Release|Any CPU
-		{752D2182-A351-41D8-99EE-DD363D7D5B43}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{752D2182-A351-41D8-99EE-DD363D7D5B43}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{752D2182-A351-41D8-99EE-DD363D7D5B43}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{752D2182-A351-41D8-99EE-DD363D7D5B43}.Release|Any CPU.Build.0 = Release|Any CPU
-		{2A47F6A8-63E5-4237-8046-94CAF321E797}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{2A47F6A8-63E5-4237-8046-94CAF321E797}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{2A47F6A8-63E5-4237-8046-94CAF321E797}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{2A47F6A8-63E5-4237-8046-94CAF321E797}.Release|Any CPU.Build.0 = Release|Any CPU
 		{AAC408FE-40EF-4479-97D9-697F2C1A0B28}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{AAC408FE-40EF-4479-97D9-697F2C1A0B28}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{AAC408FE-40EF-4479-97D9-697F2C1A0B28}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -419,10 +403,6 @@ Global
 		{7C4026CA-6434-4762-8B77-D657EAEE1325}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7C4026CA-6434-4762-8B77-D657EAEE1325}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7C4026CA-6434-4762-8B77-D657EAEE1325}.Release|Any CPU.Build.0 = Release|Any CPU
-		{305E9DFD-E73B-4A28-8769-795C25551020}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{305E9DFD-E73B-4A28-8769-795C25551020}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{305E9DFD-E73B-4A28-8769-795C25551020}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{305E9DFD-E73B-4A28-8769-795C25551020}.Release|Any CPU.Build.0 = Release|Any CPU
 		{FF3E6E08-E8E4-4523-B526-847CD989279F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{FF3E6E08-E8E4-4523-B526-847CD989279F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FF3E6E08-E8E4-4523-B526-847CD989279F}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -435,26 +415,6 @@ Global
 		{DE9130A4-F30A-49D7-8834-41DE3021218B}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{DE9130A4-F30A-49D7-8834-41DE3021218B}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{DE9130A4-F30A-49D7-8834-41DE3021218B}.Release|Any CPU.Build.0 = Release|Any CPU
-		{0C606039-BE0A-4EE6-B8F7-F75B41E52CB8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{0C606039-BE0A-4EE6-B8F7-F75B41E52CB8}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{0C606039-BE0A-4EE6-B8F7-F75B41E52CB8}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{0C606039-BE0A-4EE6-B8F7-F75B41E52CB8}.Release|Any CPU.Build.0 = Release|Any CPU
-		{41C30DC1-8C57-4E14-A83A-7635A3C7960B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{41C30DC1-8C57-4E14-A83A-7635A3C7960B}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{41C30DC1-8C57-4E14-A83A-7635A3C7960B}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{41C30DC1-8C57-4E14-A83A-7635A3C7960B}.Release|Any CPU.Build.0 = Release|Any CPU
-		{DE9EB7D8-9CC5-4073-90B3-9FBF685B3305}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{DE9EB7D8-9CC5-4073-90B3-9FBF685B3305}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{DE9EB7D8-9CC5-4073-90B3-9FBF685B3305}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{DE9EB7D8-9CC5-4073-90B3-9FBF685B3305}.Release|Any CPU.Build.0 = Release|Any CPU
-		{412C64D1-43D6-4E4C-8AD8-E20E63B415BD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{412C64D1-43D6-4E4C-8AD8-E20E63B415BD}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{412C64D1-43D6-4E4C-8AD8-E20E63B415BD}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{412C64D1-43D6-4E4C-8AD8-E20E63B415BD}.Release|Any CPU.Build.0 = Release|Any CPU
-		{0246BFC4-8AAF-45E1-A127-DB43D6E345BB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{0246BFC4-8AAF-45E1-A127-DB43D6E345BB}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{0246BFC4-8AAF-45E1-A127-DB43D6E345BB}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{0246BFC4-8AAF-45E1-A127-DB43D6E345BB}.Release|Any CPU.Build.0 = Release|Any CPU
 		{07336602-860B-4975-95DD-405D19C00901}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{07336602-860B-4975-95DD-405D19C00901}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{07336602-860B-4975-95DD-405D19C00901}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -531,10 +491,6 @@ Global
 		{41B784AA-3301-4126-AF9F-1D59BD04B0BF}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{41B784AA-3301-4126-AF9F-1D59BD04B0BF}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{41B784AA-3301-4126-AF9F-1D59BD04B0BF}.Release|Any CPU.Build.0 = Release|Any CPU
-		{D4519DF6-CC72-4AC4-A851-E21383098D11}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{D4519DF6-CC72-4AC4-A851-E21383098D11}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{D4519DF6-CC72-4AC4-A851-E21383098D11}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{D4519DF6-CC72-4AC4-A851-E21383098D11}.Release|Any CPU.Build.0 = Release|Any CPU
 		{6C7A1595-36D6-4229-BBB5-5A6B5791791D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{6C7A1595-36D6-4229-BBB5-5A6B5791791D}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6C7A1595-36D6-4229-BBB5-5A6B5791791D}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -647,6 +603,10 @@ Global
 		{19545B37-8518-4BDD-AD49-00C031FB3C2A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{19545B37-8518-4BDD-AD49-00C031FB3C2A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{19545B37-8518-4BDD-AD49-00C031FB3C2A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{79C12C80-B27B-41FB-AE79-A3BB74CFA782}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{79C12C80-B27B-41FB-AE79-A3BB74CFA782}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{79C12C80-B27B-41FB-AE79-A3BB74CFA782}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{79C12C80-B27B-41FB-AE79-A3BB74CFA782}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -690,7 +650,6 @@ Global
 		{800DB925-6014-4136-AC01-3356CF7CADD3} = {5B7FB835-3FFF-4BC2-99C5-A5B5FAE3C818}
 		{9C99621C-343E-479C-A943-332DB6129B71} = {5B7FB835-3FFF-4BC2-99C5-A5B5FAE3C818}
 		{62AF4BD3-DCAE-4D44-AA5B-991C1071166B} = {5B7FB835-3FFF-4BC2-99C5-A5B5FAE3C818}
-		{28F3EC79-660C-4659-8B73-F90DC1173316} = {A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}
 		{6D4B4FB2-0A8A-4044-948B-C063FD340439} = {A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}
 		{494902DD-C63F-48E0-BED3-B58EFB4051C8} = {A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}
 		{A0CB9A10-F22D-4E66-A449-74B3D0361A9C} = {A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}
@@ -704,6 +663,9 @@ Global
 		{19545B37-8518-4BDD-AD49-00C031FB3C2A} = {3862190B-E2C5-418E-AFDC-DB281FB5C705}
 		{87A20A76-D524-4AAC-AF92-8725BFED0415} = {A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}
 		{993E65E5-E71B-40FD-871C-60A9EBD59724} = {A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}
+		{44982E0D-C8C6-42DC-9F8F-714981F27CE6} = {7CB2F02E-03FA-4FFF-89A5-C51F107623FD}
+		{79C12C80-B27B-41FB-AE79-A3BB74CFA782} = {3277B1C0-BDFE-4460-9B0D-D9A661FB48DB}
+		{02EA681E-C7D8-13C7-8484-4AC65E1B71E8} = {A49299FB-C5CD-4E0E-B7E1-B7867BBD67CC}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {55639B5C-0770-4A22-AB56-859604650521}

README.md

@@ -6,9 +6,32 @@
 [![NuGet](https://img.shields.io/nuget/dt/OpenTelemetry.svg)](https://www.nuget.org/profiles/OpenTelemetry)
 [![Build](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/ci.yml)
 
-The .NET [OpenTelemetry](https://opentelemetry.io/) client.
+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/open-telemetry/opentelemetry-dotnet/badge)](https://scorecard.dev/viewer/?uri=github.com/open-telemetry/opentelemetry-dotnet)
+[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/10017/badge)](https://www.bestpractices.dev/projects/10017)
+[![FOSSA License Status](https://app.fossa.com/api/projects/custom%2B162%2Fgithub.com%2Fopen-telemetry%2Fopentelemetry-dotnet.svg?type=shield&issueType=license)](https://app.fossa.com/projects/custom%2B162%2Fgithub.com%2Fopen-telemetry%2Fopentelemetry-dotnet?ref=badge_shield&issueType=license)
+[![FOSSA Security Status](https://app.fossa.com/api/projects/custom%2B162%2Fgithub.com%2Fopen-telemetry%2Fopentelemetry-dotnet.svg?type=shield&issueType=security)](https://app.fossa.com/projects/custom%2B162%2Fgithub.com%2Fopen-telemetry%2Fopentelemetry-dotnet?ref=badge_shield&issueType=security)
 
-## Supported .NET Versions
+The .NET [OpenTelemetry](https://opentelemetry.io/) implementation.
+
+<details>
+<summary>Table of Contents</summary>
+
+* [Supported .NET versions](#supported-net-versions)
+* [Project status](#project-status)
+* [Getting started](#getting-started)
+  * [Getting started with Logging](#getting-started-with-logging)
+  * [Getting started with Metrics](#getting-started-with-metrics)
+  * [Getting started with Tracing](#getting-started-with-tracing)
+* [Repository structure](#repository-structure)
+* [Troubleshooting](#troubleshooting)
+* [Extensibility](#extensibility)
+* [Releases](#releases)
+* [Contributing](#contributing)
+* [References](#references)
+
+</details>
+
+## Supported .NET versions
 
 Packages shipped from this repository generally support all the officially
 supported versions of [.NET](https://dotnet.microsoft.com/download/dotnet) and
@@ -17,44 +40,88 @@ older Windows-based .NET implementation), except `.NET Framework 3.5`.
 Any exceptions to this are noted in the individual `README.md`
 files.
 
-## Project Status
+## Project status
 
-**Stable** across all 3 signals i.e. `Logs`, `Metrics`, and `Traces`.
+**Stable** across all 3 signals (`Logs`, `Metrics`, and `Traces`).
 
-See [Spec Compliance
-Matrix](https://github.com/open-telemetry/opentelemetry-specification/blob/main/spec-compliance-matrix.md)
-to understand which portions of the specification has been implemented in this
-repo.
+> [!CAUTION]
+> Certain components, marked as
+[pre-release](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/VERSIONING.md#pre-releases),
+are still work in progress and can undergo breaking changes before stable
+release. Check the individual `README.md` file for each component to understand its
+current state.
 
-## Getting Started
+To understand which portions of the [OpenTelemetry
+Specification](https://github.com/open-telemetry/opentelemetry-specification)
+have been implemented in OpenTelemetry .NET see: [Spec Compliance
+Matrix](https://github.com/open-telemetry/opentelemetry-specification/blob/main/spec-compliance-matrix.md).
+
+## Getting started
 
 If you are new here, please read the getting started docs:
 
-* [Logs](./docs/logs/README.md)
-* [Metrics](./docs/metrics/README.md)
-* [Traces](./docs/trace/README.md)
+### Getting started with Logging
 
-This repository includes multiple installable components, available on
-[NuGet](https://www.nuget.org/profiles/OpenTelemetry). Each component has its
-individual `README.md` file, which covers the instruction on how to install and
-how to get started. To find all the available components, please take a look at
-the `src` folder.
+If you are new to
+[logging](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/README.md),
+it is recommended to first follow the [getting started in 5 minutes - ASP.NET
+Core Application](./docs/logs/getting-started-aspnetcore/README.md) guide or
+the [getting started in 5 minutes - Console
+Application](./docs/logs/getting-started-console/README.md) guide to get up
+and running.
+
+For general information and best practices see: [OpenTelemetry .NET
+Logs](./docs/logs/README.md). For a more detailed explanation of SDK logging
+features see: [Customizing OpenTelemetry .NET SDK for
+Logs](./docs/logs/customizing-the-sdk/README.md).
+
+### Getting started with Metrics
+
+If you are new to
+[metrics](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/README.md),
+it is recommended to first follow the [getting started in 5 minutes - ASP.NET
+Core Application](./docs/metrics/getting-started-aspnetcore/README.md) guide
+or the [getting started in 5 minutes - Console
+Application](./docs/metrics/getting-started-console/README.md) guide to get
+up and running.
+
+For general information and best practices see: [OpenTelemetry .NET
+Metrics](./docs/metrics/README.md). For a more detailed explanation of SDK
+metric features see: [Customizing OpenTelemetry .NET SDK for
+Metrics](./docs/metrics/customizing-the-sdk/README.md).
+
+### Getting started with Tracing
+
+If you are new to
+[traces](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/README.md),
+it is recommended to first follow the [getting started in 5 minutes - ASP.NET
+Core Application](./docs/trace/getting-started-aspnetcore/README.md) guide
+or the [getting started in 5 minutes - Console
+Application](./docs/trace/getting-started-console/README.md) guide to get up
+and running.
+
+For general information and best practices see: [OpenTelemetry .NET
+Traces](./docs/trace/README.md). For a more detailed explanation of SDK tracing
+features see: [Customizing OpenTelemetry .NET SDK for
+Tracing](./docs/trace/customizing-the-sdk/README.md).
+
+## Repository structure
+
+This repository includes only what is defined in the [OpenTelemetry
+Specification](https://github.com/open-telemetry/opentelemetry-specification)
+and is shipped as separate packages through
+[NuGet](https://www.nuget.org/profiles/OpenTelemetry). Each component has an
+individual `README.md` and `CHANGELOG.md` file which covers the instructions on
+how to install and get started, and details about the individual changes made
+(respectively). To find all the available components, please take a look at the
+`src` folder.
 
 Here are the most commonly used components:
 
-* [OpenTelemetry .NET API](./src/OpenTelemetry.Api/README.md)
-* [OpenTelemetry .NET SDK](./src/OpenTelemetry/README.md)
-
-Here are the [instrumentation
-libraries](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/glossary.md#instrumentation-library):
-
-* [ASP.NET Core](./src/OpenTelemetry.Instrumentation.AspNetCore/README.md)
-* gRPC client:
-  [Grpc.Net.Client](./src/OpenTelemetry.Instrumentation.GrpcNetClient/README.md)
-* HTTP clients: [System.Net.Http.HttpClient and
-  System.Net.HttpWebRequest](./src/OpenTelemetry.Instrumentation.Http/README.md)
-* SQL clients: [Microsoft.Data.SqlClient and
-  System.Data.SqlClient](./src/OpenTelemetry.Instrumentation.SqlClient/README.md)
+* [OpenTelemetry API](./src/OpenTelemetry.Api/README.md)
+* [OpenTelemetry SDK](./src/OpenTelemetry/README.md)
+* [OpenTelemetry Hosting
+  Extensions](./src/OpenTelemetry.Extensions.Hosting/README.md)
 
 Here are the [exporter
 libraries](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/glossary.md#exporter-library):
@@ -67,15 +134,19 @@ libraries](https://github.com/open-telemetry/opentelemetry-specification/blob/ma
 * [Prometheus HttpListener](./src/OpenTelemetry.Exporter.Prometheus.HttpListener/README.md)
 * [Zipkin](./src/OpenTelemetry.Exporter.Zipkin/README.md)
 
-See the [OpenTelemetry registry](https://opentelemetry.io/registry/?s=net) and
-[OpenTelemetry .NET Contrib
-repo](https://github.com/open-telemetry/opentelemetry-dotnet-contrib) for more
-components.
+Additional packages including [instrumentation
+libraries](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/glossary.md#instrumentation-library),
+exporters, resource detectors, and extensions can be found in the
+[opentelemetry-dotnet-contrib
+repository](https://github.com/open-telemetry/opentelemetry-dotnet-contrib)
+and/or the [OpenTelemetry
+registry](https://opentelemetry.io/ecosystem/registry/?language=dotnet).
 
 ## Troubleshooting
 
-See [Troubleshooting](./src/OpenTelemetry/README.md#troubleshooting).
-Additionally check readme file for the individual components for any additional
+For general instructions see:
+[Troubleshooting](./src/OpenTelemetry/README.md#troubleshooting). Additionally
+`README.md` files for individual components may contain more detailed
 troubleshooting information.
 
 ## Extensibility
@@ -87,7 +158,7 @@ extension scenarios:
   library](./docs/trace/extending-the-sdk/README.md#instrumentation-library).
 * Building a custom exporter for
   [logs](./docs/logs/extending-the-sdk/README.md#exporter),
-  [metrics](./docs/metrics/extending-the-sdk/README.md#exporter) and
+  [metrics](./docs/metrics/extending-the-sdk/README.md#exporter), and
   [traces](./docs/trace/extending-the-sdk/README.md#exporter).
 * Building a custom processor for
   [logs](./docs/logs/extending-the-sdk/README.md#processor) and
@@ -95,14 +166,64 @@ extension scenarios:
 * Building a custom sampler for
   [traces](./docs/trace/extending-the-sdk/README.md#sampler).
 
+## Releases
+
+For details about upcoming planned releases see:
+[Milestones](https://github.com/open-telemetry/opentelemetry-dotnet/milestones).
+The dates and features described in issues and milestones are estimates and
+subject to change.
+
+For highlights and annoucements for stable releases see: [Release
+Notes](./RELEASENOTES.md).
+
+To access packages, source code, and/or view a list of changes for all
+components in a release see:
+[Releases](https://github.com/open-telemetry/opentelemetry-dotnet/releases).
+
+Nightly builds from this repo are published to [MyGet](https://www.myget.org),
+and can be installed using the
+`https://www.myget.org/F/opentelemetry/api/v3/index.json` source.
+
+### Digital signing
+
+Starting with the `1.10.0` release the DLLs included in the packages pushed to
+NuGet are digitally signed using [Sigstore](https://www.sigstore.dev/). Within
+each NuGet package the digital signature and its corresponding certificate file
+are placed alongside the shipped DLL(s) in the `/lib` folder. When a project
+targets multiple frameworks each target outputs a dedicated DLL and signing
+artifacts into a sub folder based on the
+[TFM](https://learn.microsoft.com/dotnet/standard/frameworks).
+
+The digitial signature and certificate files share the same name prefix as the
+DLL to ensure easy identification and association.
+
+To verify the integrity of a DLL inside a NuGet package use the
+[cosign](https://github.com/sigstore/cosign) tool from Sigstore:
+
+```bash
+cosign verify-blob \
+    --signature OpenTelemetry.dll-keyless.sig \
+    --certificate OpenTelemetry.dll-keyless.pem.cer \
+    --certificate-identity "https://github.com/open-telemetry/opentelemetry-dotnet/.github/workflows/publish-packages-1.0.yml@refs/tags/core-1.10.0-rc.1" \
+    --certificate-oidc-issuer "https://token.actions.githubusercontent.com" \
+    OpenTelemetry.dll
+```
+
+> [!NOTE]
+> A successful verification outputs `Verify OK`.
+
+For more verification options please refer to the [cosign
+documentation](https://github.com/sigstore/cosign/blob/main/doc/cosign_verify-blob.md).
+
 ## Contributing
 
-See [CONTRIBUTING.md](CONTRIBUTING.md)
+For information about contributing to the project see:
+[CONTRIBUTING.md](CONTRIBUTING.md).
 
 We meet weekly on Tuesdays, and the time of the meeting alternates between 9AM
 PT and 4PM PT. The meeting is subject to change depending on contributors'
 availability. Check the [OpenTelemetry community
-calendar](https://calendar.google.com/calendar/embed?src=google.com_b79e3e90j7bbsa2n2p5an5lf60%40group.calendar.google.com)
+calendar](https://github.com/open-telemetry/community?tab=readme-ov-file#calendar)
 for specific dates and for Zoom meeting links.
 
 Meeting notes are available as a public [Google
@@ -115,58 +236,60 @@ regardless of your experience level. Whether you're a seasoned OpenTelemetry
 developer, just starting your journey, or simply curious about the work we do,
 you're more than welcome to participate!
 
-[Maintainers](https://github.com/open-telemetry/community/blob/main/community-membership.md#maintainer)
-([@open-telemetry/dotnet-maintainers](https://github.com/orgs/open-telemetry/teams/dotnet-maintainers)):
+### Maintainers
 
 * [Alan West](https://github.com/alanwest), New Relic
-* [Mikel Blanchard](https://github.com/CodeBlanch), Microsoft
-* [Utkarsh Umesan Pillai](https://github.com/utpilla), Microsoft
+* [Rajkumar Rangaraj](https://github.com/rajkumar-rangaraj), Microsoft
 
-[Approvers](https://github.com/open-telemetry/community/blob/main/community-membership.md#approver)
-([@open-telemetry/dotnet-approvers](https://github.com/orgs/open-telemetry/teams/dotnet-approvers)):
+For more information about the maintainer role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#maintainer).
+
+### Approvers
 
 * [Cijo Thomas](https://github.com/cijothomas), Microsoft
-* [Reiley Yang](https://github.com/reyang), Microsoft
-* [Vishwesh Bankwar](https://github.com/vishweshbankwar), Microsoft
+* [Martin Costello](https://github.com/martincostello), Grafana Labs
+* [Mikel Blanchard](https://github.com/CodeBlanch), Microsoft
+* [Piotr Kie&#x142;kowicz](https://github.com/Kielek), Splunk
 
-[Triagers](https://github.com/open-telemetry/community/blob/main/community-membership.md#triager)
-([@open-telemetry/dotnet-triagers](https://github.com/orgs/open-telemetry/teams/dotnet-triagers)):
+For more information about the approver role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#approver).
+
+### Triagers
 
 * [Martin Thwaites](https://github.com/martinjt), Honeycomb
+* [Timothy "Mothra" Lee](https://github.com/TimothyMothra)
 
-[Emeritus
-Maintainer/Approver/Triager](https://github.com/open-telemetry/community/blob/main/community-membership.md#emeritus-maintainerapprovertriager):
+For more information about the triager role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#triager).
+
+### Emeritus Maintainers
+
+* [Mike Goldsmith](https://github.com/MikeGoldsmith)
+* [Sergey Kanzhelev](https://github.com/SergeyKanzhelev)
+* [Utkarsh Umesan Pillai](https://github.com/utpilla)
+
+For more information about the emeritus role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#emeritus-maintainerapprovertriager).
+
+### Emeritus Approvers
 
 * [Bruno Garcia](https://github.com/bruno-garcia)
 * [Eddy Nakamura](https://github.com/eddynaka)
 * [Liudmila Molkova](https://github.com/lmolkova)
-* [Mike Goldsmith](https://github.com/MikeGoldsmith)
 * [Paulo Janotti](https://github.com/pjanotti)
+* [Reiley Yang](https://github.com/reyang)
 * [Robert Paj&#x105;k](https://github.com/pellared)
-* [Sergey Kanzhelev](https://github.com/SergeyKanzhelev)
+* [Vishwesh Bankwar](https://github.com/vishweshbankwar)
+
+For more information about the emeritus role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#emeritus-maintainerapprovertriager).
+
+### Emeritus Triagers
+
 * [Victor Lu](https://github.com/victlu)
 
+For more information about the emeritus role, see the [community repository](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md#emeritus-maintainerapprovertriager).
+
 ### Thanks to all the people who have contributed
 
 [![contributors](https://contributors-img.web.app/image?repo=open-telemetry/opentelemetry-dotnet)](https://github.com/open-telemetry/opentelemetry-dotnet/graphs/contributors)
 
-## Release Schedule
+## References
 
-See the [project
-milestones](https://github.com/open-telemetry/opentelemetry-dotnet/milestones)
-for details on upcoming releases. The dates and features described in issues and
-milestones are estimates, and subject to change.
-
-See the [release
-notes](https://github.com/open-telemetry/opentelemetry-dotnet/releases) for
-existing releases.
-
-> [!CAUTION]
-> Certain components, marked as
-[pre-release](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/VERSIONING.md#pre-releases),
-are still work in progress and can undergo breaking changes before stable
-release. Check the individual `README.md` file for each component to understand its
-current state.
-
-Daily builds from this repo are published to MyGet, and can be installed from
-[this source](https://www.myget.org/F/opentelemetry/api/v3/index.json).
+* [OpenTelemetry Project](https://opentelemetry.io/)
+* [OpenTelemetry Specification](https://github.com/open-telemetry/opentelemetry-specification)

RELEASENOTES.md

@@ -0,0 +1,133 @@
+# Release Notes
+
+This file contains highlights and announcements covering all components.
+For more details see `CHANGELOG.md` files maintained in the root source
+directory of each individual package.
+
+## 1.12.0
+
+Release details: [1.12.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.12.0)
+
+* **Breaking Change**: `OpenTelemetry.Exporter.OpenTelemetryProtocol` now
+  defaults to using OTLP/HTTP instead of OTLP/gRPC when targeting .NET Framework
+  and .NET Standard. This change may cause telemetry export to fail unless
+  appropriate adjustments are made. Explicitly setting OTLP/gRPC may result in a
+  `NotSupportedException` unless further configuration is applied. See
+  [#6209](https://github.com/open-telemetry/opentelemetry-dotnet/issues/6209) for
+  full details and mitigation guidance. [#6229](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6229)
+
+## 1.11.1
+
+Release details: [1.11.1](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.11.1)
+
+* Fixed a bug preventing `OpenTelemetry.Exporter.OpenTelemetryProtocol` from
+  exporting telemetry on .NET Framework.
+
+## 1.11.0
+
+Release details: [1.11.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.11.0)
+
+* `OpenTelemetry.Exporter.OpenTelemetryProtocol` no longer depends on the
+  `Google.Protobuf`, `Grpc`, or `Grpc.Net.Client` packages. Serialization and
+  transmission of outgoing data is now performed manually to improve the overall
+  performance.
+
+## 1.10.0
+
+Release details: [1.10.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.10.0)
+
+* Bumped the package versions of `System.Diagnostic.DiagnosticSource` and other
+  Microsoft.Extensions.* packages to `9.0.0`.
+
+* Added support for new APIs introduced in `System.Diagnostics.DiagnosticSource`
+  `9.0.0`:
+
+  * [InstrumentAdvice<T>](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.instrumentadvice-1)
+
+    For details see: [Explicit bucket histogram
+    aggregation](./docs/metrics/customizing-the-sdk/README.md#explicit-bucket-histogram-aggregation).
+
+  * [Gauge<T>](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.gauge-1)
+
+  * [ActivitySource.Tags](https://learn.microsoft.com/dotnet/api/system.diagnostics.activitysource.tags)
+    (supported in OtlpExporter & ConsoleExporter)
+
+* Experimental features promoted to stable:
+
+  * `CardinalityLimit` can now be managed for individual metrics via the View
+    API. For details see: [Changing cardinality limit for a
+    Metric](./docs/metrics/customizing-the-sdk/README.md#changing-the-cardinality-limit-for-a-metric).
+
+  * The [overflow
+    attribute](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#overflow-attribute)
+    (`otel.metric.overflow`) behavior is now enabled by default. The
+    `OTEL_DOTNET_EXPERIMENTAL_METRICS_EMIT_OVERFLOW_ATTRIBUTE` environment
+    variable is no longer required. For details see: [Cardinality
+    Limits](./docs/metrics/README.md#cardinality-limits).
+
+  * The MetricPoint reclaim behavior is now enabled by default when Delta
+    aggregation temporality is used. The
+    `OTEL_DOTNET_EXPERIMENTAL_METRICS_RECLAIM_UNUSED_METRIC_POINTS` environment
+    variable is no longer required. For details see: [Cardinality
+    Limits](./docs/metrics/README.md#cardinality-limits).
+
+* Added `OpenTelemetrySdk.Create` API for configuring OpenTelemetry .NET signals
+  (logging, tracing, and metrics) via a single builder. This new API simplifies
+  bootstrap and teardown, and supports cross-cutting extensions targeting
+  `IOpenTelemetryBuilder`.
+
+* Removed out of support `net6.0` target and added `net9.0` target.
+
+## 1.9.0
+
+Release details: [1.9.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.9.0)
+
+* `Exemplars` are now part of the stable API! For details see: [customizing
+  exemplars
+  collection](https://github.com/open-telemetry/opentelemetry-dotnet/tree/main/docs/metrics/customizing-the-sdk#exemplars).
+
+* `WithLogging` is now part of the stable API! Logging, Metrics, and Tracing can
+  now all be configured using the `With` style and the builders finally have
+  parity in their APIs.
+
+## 1.8.0
+
+Release details: [1.8.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.8.0)
+
+* `TracerProvider` sampler can now be configured via the `OTEL_TRACES_SAMPLER` &
+  `OTEL_TRACES_SAMPLER_ARG` envvars.
+
+* A new `UseOtlpExporter` cross-cutting extension has been added to register the
+  `OtlpExporter` and enable all signals in a single call.
+
+* `exception.type`, `exception.message`, `exception.stacktrace` will now
+  automatically be included by the `OtlpLogExporter` when logging exceptions.
+  Previously an experimental environment variable had to be set.
+
+## 1.7.0
+
+Release details: [1.7.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.7.0)
+
+* Bumped the package versions of System.Diagnostic.DiagnosticSource and other
+  Microsoft.Extensions.* packages to `8.0.0`.
+
+* Added `net8.0` targets to all the components.
+
+* OTLP Exporter
+  * Updated to use `ILogger` `CategoryName` as the instrumentation scope for
+    logs.
+  * Added named options support for OTLP Log Exporter.
+  * Added support for instrumentation scope attributes in metrics.
+  * Added support under an experimental flag to emit log exception attributes.
+  * Added support under an experimental flag to emit log eventId and eventName.
+    attributes.
+
+* Added support for the
+  [IMetricsBuilder](https://learn.microsoft.com/dotnet/api/microsoft.extensions.diagnostics.metrics.imetricsbuilder)
+  API.
+
+* Added an experimental opt-in metrics feature to reclaim unused MetricPoints
+  which enables a higher number of unique dimension combinations to be emitted.
+  See [reclaim unused metric
+  points](https://github.com/open-telemetry/opentelemetry-dotnet/blob/32c64d04defb5c92d056fd8817638151168b10da/docs/metrics/README.md#cardinality-limits)
+  for more details.

THIRD-PARTY-NOTICES.TXT

@@ -29,3 +29,20 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+License notice for gRPC for .NET (https://github.com/grpc/grpc-dotnet)
+----------------------------------------------------------------------------------------------
+
+Copyright 2019 The gRPC Authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

VERSIONING.md

@@ -56,9 +56,9 @@ without corresponding changes here will result in build breaks - this helps
 catch any unintended changes to public API from being shipped accidentally. This
 also helps reviewers quickly understand if a given PR is proposing public API
 changes. For example,
-[this](https://github.com/open-telemetry/opentelemetry-dotnet/tree/master/src/OpenTelemetry.Instrumentation.AspNetCore/.publicApi)
+[this](https://github.com/open-telemetry/opentelemetry-dotnet/tree/master/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/.publicApi)
 shows the public APIs, per target framework for the
-`OpenTelemetry.Instrumentation.AspNetCore` package.
+`OpenTelemetry.Exporter.OpenTelemetryProtocol` package.
 
 APIs which are released as part of stable packages will be listed in the
 "Shipped.txt" file, and those APIs which are released as part of

build/Common.nonprod.props

@@ -2,13 +2,13 @@
   <Import Project=".\Common.props" />
 
   <PropertyGroup>
-    <NoWarn>$(NoWarn),1574,1591</NoWarn>
+    <NoWarn>$(NoWarn),CS1574,CS1591</NoWarn>
     <IsPackable>false</IsPackable>
     <CodeAnalysisRuleSet>$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildProjectDirectory), 'OpenTelemetry.sln'))\build\OpenTelemetry.test.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
 
   <PropertyGroup>
-    <DefaultTargetFrameworkForExampleApps>net8.0</DefaultTargetFrameworkForExampleApps>
+    <DefaultTargetFrameworkForExampleApps>net9.0</DefaultTargetFrameworkForExampleApps>
   </PropertyGroup>
 
   <PropertyGroup Condition="$(MSBuildProjectName.EndsWith('.Tests'))">
@@ -21,6 +21,18 @@
     </Content>
   </ItemGroup>
 
+  <ItemGroup Condition="'$(IsTestProject)' == 'true'">
+    <PackageReference Include="GitHubActionsTestLogger" />
+    <PackageReference Include="JunitXml.TestLogger" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+    <PackageReference Include="xunit" />
+    <PackageReference Include="xunit.runner.visualstudio" PrivateAssets="All" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(IsTestProject)' == 'true'">
+    <Compile Include="$(RepoRoot)\test\Shared\StrongNameTests.cs" Link="StrongNameTests.cs" />
+  </ItemGroup>
+
   <PropertyGroup>
     <!-- Running unit tests from VSCode does not work with .NET SDK 6.0.200 without ProduceReferenceAssemblyInOutDir -->
     <!-- Related breaking change: https://docs.microsoft.com/en-us/dotnet/core/compatibility/sdk/6.0/write-reference-assemblies-to-obj -->
@@ -44,4 +56,24 @@
 
     <Message Importance="high" Text="Skipping test execution for '$(TargetPath)' because it does not contain the '$(TargetFramework)' target." Condition="'$(_SkipTests)' == 'true'" />
   </Target>
+
+  <Target Name="ResolveExposedExperimentalFeatures" BeforeTargets="CoreCompile">
+    <!-- Note: What this does is look for $(ProjectReferenceName).BuildFlags.txt
+        files for all the dependencies of the project being compiled. If
+        ExposeExperimentalFeatures=true is found in those files we set compiler
+        constants for each project where experimental features were exposed.
+        Example:
+        OPENTELEMETRY_EXPORTER_INMEMORY_EXPERIMENTAL_FEATURES_EXPOSED;OPENTELEMETRY_EXPERIMENTAL_FEATURES_EXPOSED;OPENTELEMETRY_API_EXPERIMENTAL_FEATURES_EXPOSED;OPENTELEMETRY_API_PROVIDERBUILDEREXTENSIONS_EXPERIMENTAL_FEATURES_EXPOSED
+        -->
+    <ItemGroup>
+      <DependenciesWithExposedExperimentalFeatures
+        Include="@(_ResolvedProjectReferencePaths->'%(Filename)')"
+        Condition="$([System.IO.File]::Exists('%(RootDir)%(Directory)%(Filename).BuildFlags.txt')) AND $([System.IO.File]::ReadAllText('%(RootDir)%(Directory)%(Filename).BuildFlags.txt').Contains('ExposeExperimentalFeatures=true'))" />
+      <CompilerConstantsForDependenciesWithExposedExperimentalFeatures Include="@(DependenciesWithExposedExperimentalFeatures->'$([System.String]::Copy('%(DependenciesWithExposedExperimentalFeatures.Identity)').ToUpper().Replace('.', '_'))_EXPERIMENTAL_FEATURES_EXPOSED')" />
+    </ItemGroup>
+
+    <PropertyGroup Condition="'@(CompilerConstantsForDependenciesWithExposedExperimentalFeatures)' != ''">
+      <DefineConstants>$(DefineConstants);@(CompilerConstantsForDependenciesWithExposedExperimentalFeatures)</DefineConstants>
+    </PropertyGroup>
+  </Target>
 </Project>

build/Common.prod.props

@@ -3,6 +3,9 @@
 
   <PropertyGroup>
     <CodeAnalysisRuleSet>$(MSBuildThisFileDirectory)/OpenTelemetry.prod.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+
+  <PropertyGroup Label="BuildFlags">
     <ExposeExperimentalFeatures Condition="'$(ExposeExperimentalFeatures)' == ''">true</ExposeExperimentalFeatures>
     <EnablePackageValidation Condition="'$(EnablePackageValidation)' == ''">false</EnablePackageValidation>
   </PropertyGroup>
@@ -15,13 +18,15 @@
     <PackageProjectUrl>https://opentelemetry.io</PackageProjectUrl>
     <Authors>OpenTelemetry Authors</Authors>
     <Copyright>Copyright The OpenTelemetry Authors</Copyright>
-    <PackageOutputPath Condition="$(Build_ArtifactStagingDirectory) != ''">$(Build_ArtifactStagingDirectory)</PackageOutputPath>
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <PackagePrimaryLicenseFile>$(RepoRoot)\LICENSE.TXT</PackagePrimaryLicenseFile>
     <PackageThirdPartyNoticesFile>$(RepoRoot)\THIRD-PARTY-NOTICES.TXT</PackageThirdPartyNoticesFile>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <PackageChangelogFile>CHANGELOG.md</PackageChangelogFile>
+    <PackageReleaseNotesFile>$(RepoRoot)\RELEASENOTES.md</PackageReleaseNotesFile>
   </PropertyGroup>
 
   <PropertyGroup Label="SourceLinkProperties">
@@ -32,18 +37,34 @@
 
   <ItemGroup>
     <PackageReference Include="MinVer" PrivateAssets="All" Condition="'$(IntegrationBuild)' != 'true'" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" PrivateAssets="All" Condition="'$(IntegrationBuild)' != 'true'" />
     <PackageReference Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>
     <None Include="$(MSBuildThisFileDirectory)opentelemetry-icon-color.png" Pack="true" PackagePath="\" />
     <SourceRoot Condition="'$(Deterministic)'=='true'" Include="$(MSBuildThisFileDirectory)/" />
+    <None Include="$(IntermediateOutputPath)$(ProjectName).BuildFlags.txt"
+          Link="$(ProjectName).BuildFlags.txt"
+          CopyToOutputDirectory="PreserveNewest"
+          Visible="false" />
     <!-- Note: This includes all the PublicApiAnalyzers files in projects to make editing easier in the IDE -->
     <None Include=".publicApi\**\PublicAPI.*.txt" />
   </ItemGroup>
 
-  <Target Name="AssemblyVersionTarget" AfterTargets="MinVer" Condition="'$(MinVerVersion)'!='' AND '$(BuildNumber)' != ''">
+  <Target Name="IncludeSigningSignaturesInPackages" BeforeTargets="_GetTargetFrameworksOutput">
+    <!-- Note: This target adds any signatures found to nuget packages -->
+    <ItemGroup>
+      <SignatureFiles Include="$(RepoRoot)\src\$(MSBuildProjectName)\bin\$(Configuration)\*\$(MSBuildProjectName).dll-keyless.sig" />
+      <Content Include="@(SignatureFiles)" Link="%(RecursiveDir)%(Filename)%(Extension)" PackagePath="lib" />
+      <CertificateFiles Include="$(RepoRoot)\src\$(MSBuildProjectName)\bin\$(Configuration)\*\$(MSBuildProjectName).dll-keyless.pem" />
+      <Content Include="@(CertificateFiles)" Link="%(RecursiveDir)%(Filename)%(Extension)" PackagePath="lib" />
+    </ItemGroup>
+
+    <Message Importance="high" Text="**IncludeSignaturesInPackagesDebug** SignatureFiles: @(SignatureFiles)" />
+    <Message Importance="high" Text="**IncludeCertificatesInPackagesDebug** SignatureFiles: @(CertificateFiles)" />
+  </Target>
+
+  <Target Name="AssemblyVersionTarget" AfterTargets="MinVer" Condition="'$(MinVerVersion)' != '' AND '$(BuildNumber)' != ''">
     <!-- Note: $(BuildNumber) is typically only set for builds initiated by the
     publish workflow. The goal here is to set the assembly FileVersion and
     resolve ExposeExperimentalFeatures based on the version MinVer resolved from
@@ -54,6 +75,10 @@
       <ExposeExperimentalFeatures Condition="'$(MinVerPreRelease)' == ''">false</ExposeExperimentalFeatures>
     </PropertyGroup>
 
+    <Error
+      Condition="'$(MinVerTagPrefix)' == 'coreunstable-' AND ('$(MinVerPreRelease)' == '' OR $(MinVerPreRelease.StartsWith('rc')))"
+      Text="Unstable core packages cannot be released stable or as release candidates." />
+
     <!-- Note: The '$(TargetFramework)' != '' check here is to reduce log spam
     in builds like dotnet pack which fire MinVer but don't resolve the actual
     TargetFramework -->
@@ -63,6 +88,72 @@
       Text="**AssemblyVersionDebug** TargetFramework: $(TargetFramework), MinVerVersion: $(MinVerVersion), BuildNumber: $(BuildNumber), FileVersion: $(FileVersion), ExposeExperimentalFeatures: $(ExposeExperimentalFeatures)" />
   </Target>
 
+  <Target Name="EnsurePackageValidationBaselineVersion"
+          BeforeTargets="RunPackageValidation"
+          Condition="'$(DisablePackageBaselineValidation)' != 'true' AND '$(PackageValidationBaselineVersion)' == '' AND '$(MinVerTagPrefix)' != 'coreunstable-'">
+    <Error Text="Cannot perform package validation without a baseline package version." />
+  </Target>
+
+  <Target Name="IncludeReadmeAndReleaseNotesInPackages" BeforeTargets="_GetTargetFrameworksOutput">
+    <!-- Note: This target runs during pack to convert relative links in
+    markdowns into github permalinks which will work when rendered on Nuget. -->
+
+    <Exec
+      Command="git rev-parse HEAD"
+      ConsoleToMsBuild="True"
+      IgnoreExitCode="True"
+      StandardOutputImportance="low">
+      <Output PropertyName="GitCommitConsoleOutput" TaskParameter="ConsoleOutput"/>
+      <Output PropertyName="GitCommitExitCode" TaskParameter="ExitCode"/>
+    </Exec>
+
+    <Exec
+      Command="git remote get-url origin"
+      ConsoleToMsBuild="True"
+      IgnoreExitCode="True"
+      StandardOutputImportance="low">
+      <Output PropertyName="GitOriginConsoleOutput" TaskParameter="ConsoleOutput"/>
+      <Output PropertyName="GitOriginExitCode" TaskParameter="ExitCode"/>
+    </Exec>
+
+    <PropertyGroup>
+      <MarkdownCommentRegex>\[([^]]+?)\]\(\.(.+?)\)</MarkdownCommentRegex>
+      <GitHubRepoUrl>$(GitOriginConsoleOutput.Replace('.git',''))</GitHubRepoUrl>
+      <GitHubPermalinkUrl Condition="'$(PackTag)' != ''">$(GitHubRepoUrl)/blob/$(PackTag)</GitHubPermalinkUrl>
+      <GitHubPermalinkUrl Condition="'$(PackTag)' == ''">$(GitHubRepoUrl)/blob/$(GitCommitConsoleOutput)</GitHubPermalinkUrl>
+    </PropertyGroup>
+
+    <Message Importance="high" Text="**GitInformationDebug** GitCommitConsoleOutput: $(GitCommitConsoleOutput), GitCommitExitCode: $(GitCommitExitCode), GitOriginConsoleOutput: $(GitOriginConsoleOutput), GitOriginExitCode: $(GitOriginExitCode), GitHubPermalinkUrl: $(GitHubPermalinkUrl)" />
+
+    <ItemGroup>
+      <PackageMarkdownFiles Include="README.md" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageMarkdownFiles Update="@(PackageMarkdownFiles)" Path="$([MSBuild]::ValueOrDefault('%(FullPath)','').Replace('$(RepoRoot)', '').Replace('%(FileName)%(Extension)', ''))" />
+    </ItemGroup>
+
+    <WriteLinesToFile
+        File="$(IntermediateOutputPath)%(PackageMarkdownFiles.Filename)%(PackageMarkdownFiles.Extension)"
+        Lines="$([System.Text.RegularExpressions.Regex]::Replace($([System.IO.File]::ReadAllText(%(PackageMarkdownFiles.FullPath))), '$(MarkdownCommentRegex)', '[$1]($(GitHubPermalinkUrl)%(PackageMarkdownFiles.Path).$2)').Replace('\', '/'))"
+        Overwrite="true"
+        Encoding="UTF-8"/>
+
+    <PropertyGroup>
+      <_PackageReleaseNotesFilePath>$([System.IO.Path]::GetFullPath('$(PackageReleaseNotesFile)').Replace('$(RepoRoot)', '').Replace('\', '/'))</_PackageReleaseNotesFilePath>
+      <_PackageChangelogFilePath>$([System.IO.Path]::GetFullPath('$(PackageChangelogFile)').Replace('$(RepoRoot)', '').Replace('\', '/'))</_PackageChangelogFilePath>
+      <PackageReleaseNotes>
+        For highlights and announcements see: $(GitHubPermalinkUrl)$(_PackageReleaseNotesFilePath).
+
+        For detailed changes see: $(GitHubPermalinkUrl)$(_PackageChangelogFilePath).
+      </PackageReleaseNotes>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <Content Include="$(IntermediateOutputPath)*.md" PackagePath="/" />
+    </ItemGroup>
+  </Target>
+
   <Target Name="ResolveExposeExperimentalFeatures" BeforeTargets="CoreCompile" DependsOnTargets="AssemblyVersionTarget">
     <!-- Note: This runs for all builds. The goal here is to set the
     EXPOSE_EXPERIMENTAL_FEATURES compiler constant if
@@ -72,6 +163,15 @@
       <DefineConstants>$(DefineConstants);EXPOSE_EXPERIMENTAL_FEATURES</DefineConstants>
     </PropertyGroup>
 
+    <!-- Note: We write a file into the output dir which captures the state of
+    ExposeExperimentalFeatures for the current compilation. This is used by
+    consuming projects (tests, benchmarks, examples, etc) to add compiler
+    constants which can be used to detect experimental APIs -->
+    <WriteLinesToFile
+      File="$(IntermediateOutputPath)$(ProjectName).BuildFlags.txt"
+      Lines="ExposeExperimentalFeatures=$(ExposeExperimentalFeatures)"
+      Overwrite="true"/>
+
     <!-- Note: This selects the correct PublicApiAnalyzers files based on $(ExposeExperimentalFeatures) -->
     <ItemGroup>
       <AdditionalFiles Include=".publicApi\Stable\PublicAPI.*.txt" />

build/Common.props

@@ -4,15 +4,24 @@
     <SignAssembly>true</SignAssembly>
     <RepoRoot>$([System.IO.Directory]::GetParent($(MSBuildThisFileDirectory)).Parent.FullName)</RepoRoot>
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)debug.snk</AssemblyOriginatorKeyFile>
-    <DefineConstants>$(DefineConstants);SIGNED</DefineConstants>
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
+    <NuGetAudit>true</NuGetAudit>
+    <NuGetAuditMode>all</NuGetAuditMode>
+    <NuGetAuditLevel>low</NuGetAuditLevel>
     <!-- Suppress warnings for repo code using experimental features -->
-    <NoWarn>$(NoWarn);OTEL1000;OTEL1001;OTEL1002;OTEL1003</NoWarn>
-    <!--temporarily disable. See 3958-->
-    <!--<AnalysisLevel>latest-All</AnalysisLevel>-->
+    <NoWarn>$(NoWarn);OTEL1000;OTEL1001;OTEL1002;OTEL1004</NoWarn>
+    <AnalysisLevel>latest-All</AnalysisLevel>
+  </PropertyGroup>
+
+  <PropertyGroup Condition=" '$(SignAssembly)' == 'true' ">
+    <StrongNamePublicKey>002400000480000094000000060200000024000052534131000400000100010051C1562A090FB0C9F391012A32198B5E5D9A60E9B80FA2D7B434C9E5CCB7259BD606E66F9660676AFC6692B8CDC6793D190904551D2103B7B22FA636DCBB8208839785BA402EA08FC00C8F1500CCEF28BBF599AA64FFB1E1D5DC1BF3420A3777BADFE697856E9D52070A50C3EA5821C80BEF17CA3ACFFA28F89DD413F096F898</StrongNamePublicKey>
+  </PropertyGroup>
+
+  <PropertyGroup Label="BuildFlags">
+    <RunningDotNetPack Condition="'$(RunningDotNetPack)' == ''">false</RunningDotNetPack>
   </PropertyGroup>
 
   <!-- OmniSharp/VS Code requires TargetFrameworks to be in descending order for IntelliSense and analysis. -->
@@ -21,20 +30,19 @@
     <NetFrameworkSupportedVersions>net481;net48;net472;net471;net47;net462</NetFrameworkSupportedVersions>
 
     <!-- production TFMs -->
-    <TargetFrameworksForLibraries>net8.0;net6.0;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibraries>
-    <TargetFrameworksForLibrariesExtended>net8.0;net6.0;netstandard2.1;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibrariesExtended>
-    <TargetFrameworksForAspNetCoreInstrumentation>net8.0;net7.0;net6.0;netstandard2.0</TargetFrameworksForAspNetCoreInstrumentation>
-    <TargetFrameworksForGrpcNetClientInstrumentation>net8.0;net6.0;netstandard2.1;netstandard2.0</TargetFrameworksForGrpcNetClientInstrumentation>
-    <TargetFrameworksForPrometheusAspNetCore>net8.0;net6.0</TargetFrameworksForPrometheusAspNetCore>
+    <TargetFrameworksForLibraries>net9.0;net8.0;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibraries>
+    <TargetFrameworksForLibrariesExtended>net9.0;net8.0;netstandard2.1;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksForLibrariesExtended>
+    <TargetFrameworksForPrometheusAspNetCore>net9.0;net8.0</TargetFrameworksForPrometheusAspNetCore>
+    <TargetFrameworksRequiringSystemTextJsonDirectReference>net8.0;netstandard2.1;netstandard2.0;$(NetFrameworkMinimumSupportedVersion)</TargetFrameworksRequiringSystemTextJsonDirectReference>
 
     <!-- non-production TFMs -->
-    <TargetFrameworksForAspNetCoreTests>net8.0;net7.0;net6.0</TargetFrameworksForAspNetCoreTests>
-    <TargetFrameworksForAotCompatibilityTests>net8.0</TargetFrameworksForAotCompatibilityTests>
-    <TargetFrameworksForDocs>net8.0;net7.0;net6.0</TargetFrameworksForDocs>
+    <TargetFrameworksForAspNetCoreTests>net9.0;net8.0</TargetFrameworksForAspNetCoreTests>
+    <TargetFrameworksForAotCompatibilityTests>net9.0;net8.0</TargetFrameworksForAotCompatibilityTests>
+    <TargetFrameworksForDocs>net9.0;net8.0</TargetFrameworksForDocs>
     <TargetFrameworksForDocs Condition="$(OS) == 'Windows_NT' And '$(UsingMicrosoftNETSdkWeb)' != 'True'">
       $(TargetFrameworksForDocs);$(NetFrameworkSupportedVersions)
     </TargetFrameworksForDocs>
-    <TargetFrameworksForTests>net8.0;net7.0;net6.0</TargetFrameworksForTests>
+    <TargetFrameworksForTests>net9.0;net8.0</TargetFrameworksForTests>
     <TargetFrameworksForTests Condition="$(OS) == 'Windows_NT'">
       $(TargetFrameworksForTests);$(NetFrameworkMinimumSupportedVersion)
     </TargetFrameworksForTests>
@@ -59,20 +67,11 @@
     <PackageReference Include="StyleCop.Analyzers" PrivateAssets="All" Condition="'$(SkipAnalysis)'!='true'" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(IncludeDiagnosticSourceInstrumentationHelpers)'=='true'">
-    <Compile Include="$(RepoRoot)\src\Shared\ActivityInstrumentationHelper.cs" Link="Includes\ActivityInstrumentationHelper.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\DiagnosticSourceInstrumentation\DiagnosticSourceListener.cs" Link="Includes\DiagnosticSourceListener.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\DiagnosticSourceInstrumentation\DiagnosticSourceSubscriber.cs" Link="Includes\DiagnosticSourceSubscriber.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\DiagnosticSourceInstrumentation\ListenerHandler.cs" Link="Includes\ListenerHandler.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\DiagnosticSourceInstrumentation\PropertyFetcher.cs" Link="Includes\PropertyFetcher.cs" />
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(IncludeInstrumentationHelpers)'=='true' Or '$(IncludeDiagnosticSourceInstrumentationHelpers)'=='true'">
+  <ItemGroup Condition="'$(IncludeInstrumentationHelpers)'=='true'">
     <Compile Include="$(RepoRoot)\src\Shared\ActivityHelperExtensions.cs" Link="Includes\ActivityHelperExtensions.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\ExceptionExtensions.cs" Link="Includes\ExceptionExtensions.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\SemanticConventions.cs" Link="Includes\SemanticConventions.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\SpanAttributeConstants.cs" Link="Includes\SpanAttributeConstants.cs" />
-    <Compile Include="$(RepoRoot)\src\Shared\SpanHelper.cs" Link="Includes\SpanHelper.cs" />
     <Compile Include="$(RepoRoot)\src\Shared\StatusHelper.cs" Link="Includes\StatusHelper.cs" />
   </ItemGroup>
 

build/Common.targets

@@ -0,0 +1,12 @@
+<Project>
+
+  <ItemGroup Condition="'$(ReferenceSystemTextJsonPackages)' == 'true' AND $(TargetFrameworksRequiringSystemTextJsonDirectReference.Contains('$(TargetFramework)'))">
+    <!-- Note: System.Text.Encodings.Web is referenced on NET Framework & NET
+    Standard targets because System.Text.Json v4.7.2 uses
+    System.Text.Encodings.Web >= v4.7.1 but System.Text.Encodings.Web needs to
+    be at v4.7.2 to be safe. -->
+    <PackageReference Include="System.Text.Encodings.Web" Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'" />
+    <PackageReference Include="System.Text.Json" />
+  </ItemGroup>
+
+</Project>

build/InstrumentationLibraries.proj

@@ -1,18 +0,0 @@
-<Project>
-  <ItemGroup>
-    <SolutionProjects Include="..\**\OpenTelemetry.Instrumentation*.csproj" />
-    <TestProjects Include="..\test\**\OpenTelemetry.Instrumentation*.csproj" />
-  </ItemGroup>
-
-  <Target Name="Build">
-    <MSBuild Projects="@(SolutionProjects)" Targets="Build" ContinueOnError="ErrorAndStop" />
-  </Target>
-
-  <Target Name="Restore">
-    <MSBuild Projects="@(SolutionProjects)" Targets="Restore" ContinueOnError="ErrorAndStop" />
-  </Target>
-
-  <Target Name="VSTest">
-    <MSBuild Projects="@(TestProjects)" Targets="VSTest" ContinueOnError="ErrorAndStop" />
-  </Target>
-</Project>

build/OpenTelemetry.proj

@@ -1,19 +1,18 @@
 <Project>
-  <ItemGroup>
-    <SolutionProjects Include="**\*.csproj" />
-    <PackProjects Include="src\**\*.csproj" />
-    <TestProjects Include="test\**\*.csproj" />
+  <PropertyGroup>
+    <RepoRoot>$([System.IO.Directory]::GetParent($(MSBuildThisFileDirectory)).Parent.FullName)</RepoRoot>
+  </PropertyGroup>
 
-    <!-- Not pack SemanticConventions project for now -->
-    <PackProjects Remove="src\OpenTelemetry.SemanticConventions\OpenTelemetry.SemanticConventions.csproj" />
+  <ItemGroup>
+    <SolutionProjects Include="$(RepoRoot)\**\*.csproj" />
+    <PackProjects Include="$(RepoRoot)\src\**\*.csproj" />
+    <TestProjects Include="$(RepoRoot)\test\**\*.csproj" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(RunningDotNetPack)' == 'true'">
-    <!-- Skip building these projects when publish packages workflow runs as
-    these projects need to depend upon instrumentation libraries taking a
-    project reference instead of package reference on API/SDK -->
-    <SolutionProjects Remove="docs\**\**\*.csproj" />
-    <SolutionProjects Remove="examples\**\*.csproj" />
+    <!-- Skip building these projects when publish packages workflow runs -->
+    <SolutionProjects Remove="$(RepoRoot)\docs\**\*.csproj" />
+    <SolutionProjects Remove="$(RepoRoot)\examples\**\*.csproj" />
     <SolutionProjects Remove="@(TestProjects)" />
   </ItemGroup>
 

build/RELEASING.md

@@ -1,141 +1,218 @@
 # Release process
 
-Only for Maintainers.
+**Note: Approvers (collaborators) can perform much of the release process but
+Maintainers (admins) are needed to merge PRs and for the push to NuGet.**
 
- 1. Decide the tag name (version name) to be released. e.g. 1.4.0-beta.1,
-    1.0.0-rc9.7 etc.
-
- 2. Run the following PowerShell from the root of the repo to get combined
-    changelog (to be used later).
-
-    ```powershell
-        $changelogs = Get-ChildItem -Path . -Recurse -Filter changelog.md
-        foreach ($changelog in $changelogs)
-        {
-         Add-Content -Path .\combinedchangelog.md -Value "**$($changelog.Directory.Name)**"
-         $lines = Get-Content -Path $changelog.FullName
-         $started = $false
-         $ended = $false
-         foreach ($line in $lines)
-             {
-                if($line -like "## Unreleased" -and $started -ne $true)
-                {
-                  $started = $true
-                }
-                elseif($line -like "## *" -and $started -eq $true)
-                {
-                  $ended = $true
-                  break
-                }
-                else
-                {
-                    if ($started -eq $true)
-                    {
-                        Add-Content -Path .\combinedchangelog.md $line
-                    }
-                }
-             }
-        }
-    ```
-
-    This generates combined changelog to be used in GitHub release. Once
-    contents of combined changelog is saved somewhere, delete the file.
-
- 3. Run the following PowerShell script from the root of the repo. This updates
-    all the changelog to have release date for the current version being
-    released. Replace the version with actual version. In the script below,
-    replace `1.4.0-beta.1` with the tag name chosen for the package in Step 1.
-
-    ```powershell
-         $changelogs = Get-ChildItem -Path . -Recurse -Filter changelog.md
-        foreach ($changelog in $changelogs)
-        {
-         (Get-Content -Path $changelog.FullName) -replace "Unreleased", "Unreleased
-
-    ## 1.4.0-beta.1
-
-    Released $(Get-Date -UFormat '%Y-%b-%d')" | Set-Content -Path $changelog.FullName
-        }
-    ```
-
- 4. Normalize PublicApi files (Stable Release Only): Run the PowerShell script
-    `.\build\finalize-publicapi.ps1`. This will merge the contents of
-    Unshipped.txt into the Shipped.txt.
-
- 5. Submit PR with the above changes, and get it merged.
-
- 6. Tag Git with version to be released. We use
+ 1. Decide the component(s) and tag name (version name) to be released. We use
     [MinVer](https://github.com/adamralph/minver) to do versioning, which
     produces version numbers based on git tags.
 
-    Note: If releasing only core components, only add and push the tag prefixed
-    with `core-`. For example:
+    Notes:
 
-    ```sh
-    git tag -a core-1.4.0-beta.1 -m "1.4.0-beta.1 of all core components"
-    git push origin core-1.4.0-beta.1
-    ```
+       * There are different categories of packages. Check the project file for
+         what you want to release and look for `MinVerTagPrefix`.
 
-    If releasing only non-core components, only add and push the tags without
-    prefix. For example:
+         * `core-`: Core packages. These packages are defined\goverened by the
+           OpenTelemetry Specification or are part of fundamental infrastructure
+           and have released stable versions. They may be released as `alpha`,
+           `beta`, `rc`, or stable.
 
-    ```sh
-    git tag -a 1.0.0-rc9.7 -m "1.0.0-rc9.7 of all non-core components"
-    git push origin 1.0.0-rc9.7
-    ```
+           * `OpenTelemetry.Api` - Defined by spec (API)
+           * `OpenTelemetry.Api.ProviderBuilderExtensions` - Fundamental
+             infrastructure
+           * `OpenTelemetry` - Defined by spec (SDK)
+           * `OpenTelemetry.Exporter.Console` - Defined by spec
+           * `OpenTelemetry.Exporter.InMemory` - Defined by spec
+           * `OpenTelemetry.Exporter.OpenTelemetryProtocol` - Defined by spec
+           * `OpenTelemetry.Exporter.Zipkin` - Defined by spec
+           * `OpenTelemetry.Extensions.Hosting` - Fundamental infrastructure
+           * `OpenTelemetry.Extensions.Propagators` - Defined by spec
 
-    If releasing only a particular non-core component which has a dedicated
-    MinverTagPrefix such as AspNetCore instrumentation, only add and push the
-    tag with that particular prefix. For example:
+         * `coreunstable-`: Core unstable packages. These packages are
+           defined\goverened by the OpenTelemetry Specification or are part of
+           fundamental infrastructure but have not released stable versions. As
+           of the `1.9.0` release cycle they may only be released as `alpha` or
+           `beta`.
 
-    ```sh
-    git tag -a Instrumentation.AspNetCore-1.6.0 -m "1.6.0 of AspNetCore instrumentation library"
-    git push origin Instrumentation.AspNetCore-1.6.0
-    ```
+           * `OpenTelemetry.Exporter.Prometheus.AspNetCore` - Defined by spec
+             (experimental)
+           * `OpenTelemetry.Exporter.Prometheus.HttpListener` - Defined by spec
+             (experimental)
+           * `OpenTelemetry.Shims.OpenTracing` - Defined by spec (stable but
+             incomplete implementation)
 
-    If releasing multiple kinds of components, push both tags for each of them.
+       * As of the `1.9.0` release cycle core unstable packages always depend on
+         the stable versions of core packages. Before releasing a non-core
+         component ensure the `OTelLatestStableVer` property in
+         `Directory.Packages.props` has been updated to the latest stable core
+         version.
 
- 7. Go to the [list of
-    tags](https://github.com/open-telemetry/opentelemetry-dotnet/tags)
-    and find the tag created for the core components. Click the three
-    dots next to the tag and choose `Create release`.
-      * Give the release a name based on the tags created
-      (e.g., `1.4.0-beta.1 / 1.0.0-rc9.7`).
-      * Paste the contents of combined changelog from Step 2.
-      * Check "This is a pre-release" if applicable.
-      * Click "Publish release". This will kick off the [Pack and publish to
-      MyGet workflow](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml).
+ 2. Run the [Prepare for a
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow. Specify the `tag-prefix` and the `version` for the release. Make
+    sure to run the workflow on the branch being released. This is typically
+    `main` but could be some other branch for hotfix (eg `main-1.8.0`). The
+    workflow will open a PR to update `CHANGELOG.md` files for the projects
+    being released. If a stable version is specified as the `version` parameter,
+    the workflow will also merge the contents of any detected
+    `PublicAPI.Unshipped.txt` files in the `.publicApi` folder into the
+    corresponding `PublicAPI.Shipped.txt` files for the projects being released.
 
- 8. Validate using MyGet packages. Basic sanity checks :)
+    <details>
+    <summary>Instructions for preparing for a release manually</summary>
 
- 9. From the above build, get the artifacts from the drop, which has all the
-    NuGet packages.
+    * Update CHANGELOG files
 
-10. Copy all the NuGet files and symbols into a local folder. If only releasing
-    core packages, only copy them over.
+       Run the PowerShell script `.\build\scripts\update-changelogs.ps1
+       -minVerTagPrefix [MinVerTagPrefix] -version [Version]`. Where
+       `[MinVerTagPrefix]` is the tag prefix (eg `core-`) for the components
+       being released and `[Version]` is the version being released (eg
+       `1.9.0`). This will update `CHANGELOG.md` files for the projects being
+       released.
 
-11. Download latest [nuget.exe](https://www.nuget.org/downloads) into the same
-    folder from Step 9.
+    * **Stable releases only**: Normalize PublicApi files
 
-12. Obtain the API key from nuget.org (Only maintainers have access)
+       Run the PowerShell script `.\build\scripts\finalize-publicapi.ps1
+       -minVerTagPrefix [MinVerTagPrefix]`. Where `[MinVerTagPrefix]` is the tag
+       prefix (eg `core-`) for the components being released. This will merge
+       the contents of any detected `PublicAPI.Unshipped.txt` files in the
+       `.publicApi` folder into the corresponding `PublicAPI.Shipped.txt` files
+       for the projects being released.
+    </details
 
-13. Run the following commands from PowerShell from local folder used in Step 9:
+ 3. For stable releases, use the `/UpdateReleaseNotes` command on the PR opened
+    by [Prepare for a
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow in step 2 to update [Release Notes](../RELEASENOTES.md) with any
+    big or interesting new features.
 
-    ```powershell
-    .\nuget.exe setApiKey <actual api key>
+    * The `/UpdateReleaseDates` command may also be used to update dates in
+      `CHANGELOG.md` files. This is useful when the PR is opened a few days
+      before the planned release date to review public API changes.
 
-    get-childitem -Recurse | where {$_.extension -eq ".nupkg"} | foreach ($_) {.\nuget.exe push $_.fullname -Source https://api.nuget.org/v3/index.json}
-    ```
+ 4. :stop_sign: The PR opened by [Prepare for a
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow in step 2 has to be merged.
 
-14. Packages would be available in nuget.org in few minutes. Validate that the
-    package is uploaded.
+ 5. Once the PR opened by [Prepare for a
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow in step 2 has been merged a trigger will automatically add a
+    comment and lock the PR. Post a comment with "/CreateReleaseTag" in the
+    body. This will tell the [Prepare for a
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow to push the tag for the merge commit of the PR which will trigger
+    the [Build, pack, and publish to
+    MyGet](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml)
+    workflow.
 
-15. Delete the API key generated in Step 11.
+    <details>
+    <summary>Instructions for pushing tags manually</summary>
 
-16. Update the OpenTelemetry.io document
-    [here](https://github.com/open-telemetry/opentelemetry.io/tree/main/content/en/docs/net)
-    by sending a Pull Request.
+    Note: In the below examples `git push origin` is used. If running in a fork,
+    add the main repo as `upstream` and use `git push upstream` instead. Pushing
+    a tag to `origin` in a fork pushes the tag to the fork.
 
-17. If a new stable version of the core packages were released, update
-    `OTelLatestStableVer` in Directory.Packages.props to the just released
-    stable version.
+    * If releasing core components, add and push the tag prefixed with `core-`.
+    For example:
+
+       ```sh
+       git tag -a core-1.4.0-beta.1 -m "1.4.0-beta.1 of all core components"
+       git push origin core-1.4.0-beta.1
+       ```
+
+    * If releasing core unstable components, push the tag prefixed with
+    `coreunstable-`. For example:
+
+       ```sh
+       git tag -a coreunstable-1.9.0-beta.1 -m "1.9.0-beta.1 of all core unstable components"
+       git push origin coreunstable-1.9.0-beta.1
+       ```
+
+    Pushing the tag will kick off the [Build, pack, and publish to
+    MyGet](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml)
+    workflow.
+    </details>
+
+ 6. :stop_sign: Wait for the [Build, pack, and publish to
+    MyGet](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml)
+    workflow to complete. When complete a trigger will automatically add a
+    comment on the PR opened by [Prepare for a
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow in step 2. Use MyGet or download the packages using the provided
+    link to validate locally everything works. After validation has been
+    performed have a maintainer post a comment with "/PushPackages" in the body.
+    This will trigger the [Complete
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow to push the packages to NuGet and publish the draft release created
+    by the [Build, pack, and publish to
+    MyGet](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml)
+    workflow. Comments will automatically be added on the PR opened by [Prepare
+    for a
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/prepare-release.yml)
+    workflow in step 2 as the process is run and the PR will be unlocked.
+
+    <details>
+    <summary>Instructions for pushing packages to NuGet manually</summary>
+
+    1. The [Build, pack, and publish to
+       MyGet](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml)
+       workflow pushes the packages to MyGet and attaches them as artifacts on
+       the workflow run.
+
+    2. Validate locally everything works using the packages pushed to MyGet or
+       downloaded from the drop attached to the workflow run. Basic sanity
+       checks :)
+
+    3. Download the artifacts from the drop attached to the workflow run. The
+       artifacts archive (`.zip`) contains all the NuGet packages (`.nupkg`) and
+       symbols (`.snupkg`) from the build which were pushed to MyGet.
+
+    4. Extract the artifacts from the archive (`.zip`) into a local folder.
+
+    5. Download latest [nuget.exe](https://www.nuget.org/downloads) into the
+       same folder from step 4.
+
+    6. Create or regenerate an API key from nuget.org (only maintainers have
+       access). When creating API keys make sure it is set to expire in 1 day or
+       less.
+
+    7. Run the following commands from PowerShell from local folder used in step
+       4:
+
+       ```powershell
+       .\nuget.exe setApiKey <actual api key>
+
+       get-childitem -Recurse | where {$_.extension -eq ".nupkg"} | foreach ($_) {.\nuget.exe push $_.fullname -Source https://api.nuget.org/v3/index.json}
+       ```
+
+    8. Validate that the package(s) are uploaded. Packages are available
+       immediately to maintainers on nuget.org but aren't publicly visible until
+       scanning completes. This process usually takes a few minutes.
+
+    9. Open the
+       [Releases](https://github.com/open-telemetry/opentelemetry-dotnet/releases)
+       page on the GitHub repository. The [Build, pack, and publish to
+       MyGet](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml)
+       workflow creates a draft release for the tag which was pushed. Edit the
+       draft Release and click `Publish release`.
+    </details>
+
+ 7. If a new stable version of the core packages was released, a PR should have
+    been automatically created by the [Complete
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/post-release.yml)
+    workflow to update the `OTelLatestStableVer` property in
+    `Directory.Packages.props` to the just released stable version. Merge that
+    PR once the build passes (this requires the packages be available on NuGet).
+
+ 8. The [Complete
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/post-release.yml)
+    workflow should have invoked the [Core version
+    update](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/actions/workflows/core-version-update.yml)
+    workflow on the
+    [opentelemetry-dotnet-contrib](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/)
+    repository which opens a PR to update dependencies. Verify this PR was
+    opened successfully.
+
+ 9. For stable releases post an announcement in the [Slack
+    channel](https://cloud-native.slack.com/archives/C01N3BC2W7Q) announcing the
+    release and link to the release notes.

build/UnstableCoreLibraries.proj

@@ -0,0 +1,27 @@
+<Project>
+  <PropertyGroup>
+    <RepoRoot>$([System.IO.Directory]::GetParent($(MSBuildThisFileDirectory)).Parent.FullName)</RepoRoot>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <SolutionProjects Include="$(RepoRoot)\**\OpenTelemetry.Exporter.Prometheus.AspNetCore*.csproj" />
+    <SolutionProjects Include="$(RepoRoot)\**\OpenTelemetry.Exporter.Prometheus.HttpListener*.csproj" />
+    <SolutionProjects Include="$(RepoRoot)\**\OpenTelemetry.Shims.OpenTracing*.csproj" />
+
+    <TestProjects Include="$(RepoRoot)\test\**\OpenTelemetry.Exporter.Prometheus.AspNetCore.Tests.csproj" />
+    <TestProjects Include="$(RepoRoot)\test\**\OpenTelemetry.Exporter.Prometheus.HttpListener.Tests.csproj" />
+    <TestProjects Include="$(RepoRoot)\test\**\OpenTelemetry.Shims.OpenTracing.Tests.csproj" />
+  </ItemGroup>
+
+  <Target Name="Build">
+    <MSBuild Projects="@(SolutionProjects)" Targets="Build" ContinueOnError="ErrorAndStop" />
+  </Target>
+
+  <Target Name="Restore">
+    <MSBuild Projects="@(SolutionProjects)" Targets="Restore" ContinueOnError="ErrorAndStop" />
+  </Target>
+
+  <Target Name="VSTest">
+    <MSBuild Projects="@(TestProjects)" Targets="VSTest" ContinueOnError="ErrorAndStop" />
+  </Target>
+</Project>

build/docker-compose.net6.0.yml

@@ -1,9 +0,0 @@
-version: '3.7'
-
-services:
-  tests:
-    build:
-      args:
-        PUBLISH_FRAMEWORK: net6.0
-        TEST_SDK_VERSION: "6.0"
-        BUILD_SDK_VERSION: "8.0"

build/docker-compose.net7.0.yml

@@ -1,9 +0,0 @@
-version: '3.7'
-
-services:
-  tests:
-    build:
-      args:
-        PUBLISH_FRAMEWORK: net7.0
-        TEST_SDK_VERSION: "7.0"
-        BUILD_SDK_VERSION: "8.0"

build/docker-compose.net8.0.yml

@@ -1,9 +1,7 @@
-version: '3.7'
-
 services:
   tests:
     build:
       args:
         PUBLISH_FRAMEWORK: net8.0
         TEST_SDK_VERSION: "8.0"
-        BUILD_SDK_VERSION: "8.0"
+        BUILD_SDK_VERSION: "9.0"

build/docker-compose.net9.0.yml

@@ -0,0 +1,7 @@
+services:
+  tests:
+    build:
+      args:
+        PUBLISH_FRAMEWORK: net9.0
+        TEST_SDK_VERSION: "9.0"
+        BUILD_SDK_VERSION: "9.0"

build/finalize-publicapi.ps1

@@ -1,31 +0,0 @@
-# After every stable release, all PublicApi text files (Shipped & Unshipped) should be merged.
-$path = "src\*\.publicApi\**\";
-$directory = Split-Path -Path $PSScriptRoot -Parent;
-
-$searchPath = Join-Path -Path $directory -ChildPath $path;
-Write-Host "Search Directory: $searchPath";
-Write-Host "";
-
-Get-ChildItem -Path $searchPath -Recurse -Filter *.Shipped.txt | 
-    ForEach-Object {
-        Write-Host $_.FullName;
-
-        [string]$shipped = $_.FullName;
-        [string]$unshipped = $shipped -replace ".shipped.txt", ".Unshipped.txt";
-
-        if (Test-Path $unshipped) {
-            Write-Host $unshipped;
-
-            Get-Content $shipped, $unshipped |  # get contents of both text files
-                Where-Object {$_ -ne ""} |      # filter empty lines
-                Sort-Object |                   # sort lines
-                Get-Unique |                    # filter duplicates
-                Set-Content $shipped;           # write to shipped.txt
-
-            Clear-Content $unshipped;           # empty unshipped.txt
-
-            Write-Host "...MERGED and SORTED";
-        }
-
-        Write-Host "";
-    }

build/scripts/add-labels.psm1

@@ -0,0 +1,148 @@
+function AddLabelsOnIssuesForPackageFoundInBody {
+  param(
+    [Parameter(Mandatory=$true)][int]$issueNumber,
+    [Parameter(Mandatory=$true)][string]$issueBody
+  )
+
+  $match = [regex]::Match($issueBody, '^[#]+ Package\s*(OpenTelemetry(?:\.\w+)*)')
+  if ($match.Success -eq $false)
+  {
+      Return
+  }
+
+  gh issue edit $issueNumber --add-label $("pkg:" + $match.Groups[1].Value)
+}
+
+Export-ModuleMember -Function AddLabelsOnIssuesForPackageFoundInBody
+
+function AddLabelsOnPullRequestsBasedOnFilesChanged {
+  param(
+    [Parameter(Mandatory=$true)][int]$pullRequestNumber,
+    [Parameter(Mandatory=$true)][string]$labelPackagePrefix # 'pkg:' on main repo, 'comp:' on contrib repo
+  )
+
+  # Note: This function is intended to work on main repo and on contrib. Please
+  # keep them in sync.
+
+  $repoLabels = gh label list --json name,id -L 200 | ConvertFrom-Json
+
+  $filesChangedOnPullRequest = gh pr diff $pullRequestNumber --name-only
+
+  $labelsOnPullRequest = (gh pr view $pullRequestNumber --json labels | ConvertFrom-Json).labels
+
+  $visitedProjects = New-Object System.Collections.Generic.HashSet[string]
+  $labelsToAdd = New-Object System.Collections.Generic.HashSet[string]
+  $labelsToRemove = New-Object System.Collections.Generic.HashSet[string]
+
+  # Note: perf label may be added but it is kind of a guess so we don't remove
+  # it automatically in order to also allow manual inclusion after reviewing files
+  $managedLabels = 'infra', 'documentation', 'dependencies'
+  $rootInfraFiles = 'global.json', 'NuGet.config', 'codeowners'
+  $documentationFiles = 'readme.md', 'contributing.md', 'releasing.md', 'versioning.md', 'releasenotes.md'
+
+  foreach ($fileChanged in $filesChangedOnPullRequest)
+  {
+    $fileChanged = $fileChanged.ToLower()
+    $fullFileName = [System.IO.Path]::GetFileName($fileChanged)
+    $fileName = [System.IO.Path]::GetFileNameWithoutExtension($fileChanged)
+    $fileExtension = [System.IO.Path]::GetExtension($fileChanged)
+
+    if ($fileChanged.StartsWith('src/') -or $fileChanged.StartsWith('test/'))
+    {
+      $match = [regex]::Match($fileChanged, '^(?:(?:src)|(?:test))\/(.*?)\/.+$')
+      if ($match.Success -eq $false)
+      {
+          continue
+      }
+      $rawProjectName = $match.Groups[1].Value
+      if ($rawProjectName.Contains(".benchmarks") -or $rawProjectName.Contains(".stress"))
+      {
+        $added = $labelsToAdd.Add("perf")
+      }
+
+      $projectName = $rawProjectName.Replace(".tests", "").Replace(".benchmarks", "").Replace(".stress", "")
+      if ($visitedProjects.Contains($projectName))
+      {
+        continue
+      }
+
+      $added = $visitedProjects.Add($projectName);
+
+      foreach ($repoLabel in $repoLabels)
+      {
+        if ($repoLabel.name.StartsWith($labelPackagePrefix))
+        {
+            $package = $repoLabel.name.Substring($labelPackagePrefix.Length).ToLower()
+            if ($package.StartsWith('opentelemetry') -eq $false)
+            {
+                # Note: On contrib labels don't have "OpenTelemetry." prefix
+                $package = 'opentelemetry.' + $package
+            }
+            if ($package -eq $projectName)
+            {
+                $added = $labelsToAdd.Add($repoLabel.name)
+                break
+            }
+        }
+      }
+    }
+
+    if ($documentationFiles.Contains($fullFileName) -or
+        $fileChanged.StartsWith('docs/') -or
+        $fileChanged.StartsWith('examples/'))
+    {
+        $added = $labelsToAdd.Add("documentation")
+    }
+
+    if ($fileChanged.StartsWith('build/') -or
+        $fileChanged.StartsWith('.github/') -or
+        $rootInfraFiles.Contains($fullFileName) -or
+        $fileExtension -eq ".props" -or
+        $fileExtension -eq ".targets" -or
+        $fileChanged.StartsWith('test/openTelemetry.aotcompatibility'))
+    {
+        $added = $labelsToAdd.Add("infra")
+    }
+
+    if ($fileChanged.StartsWith('test/benchmarks'))
+    {
+        $added = $labelsToAdd.Add("perf")
+    }
+
+    if ($fullFileName -eq 'directory.packages.props')
+    {
+        $added = $labelsToAdd.Add("dependencies")
+    }
+  }
+
+  foreach ($labelOnPullRequest in $labelsOnPullRequest)
+  {
+     if ($labelsToAdd.Contains($labelOnPullRequest.name))
+     {
+        $removed = $labelsToAdd.Remove($labelOnPullRequest.name)
+     }
+     elseif ($labelOnPullRequest.name.StartsWith($labelPackagePrefix) -or
+        $managedLabels.Contains($labelOnPullRequest.name))
+     {
+        $added = $labelsToRemove.Add($labelOnPullRequest.name)
+     }
+  }
+
+  if ($labelsToAdd.Count -gt 0)
+  {
+      foreach ($label in $labelsToAdd)
+      {
+        gh pr edit $pullRequestNumber --add-label $label
+      }
+  }
+
+  if ($labelsToRemove.Count -gt 0)
+  {
+      foreach ($label in $labelsToRemove)
+      {
+        gh pr edit $pullRequestNumber --remove-label $label
+      }
+  }
+}
+
+Export-ModuleMember -Function AddLabelsOnPullRequestsBasedOnFilesChanged

build/scripts/finalize-publicapi.ps1

@@ -0,0 +1,39 @@
+param(
+  [Parameter(Mandatory=$true)][string]$minVerTagPrefix
+)
+
+# For stable releases "Unshipped" PublicApi text files are merged into "Shipped" versions.
+
+$projectDirs = Get-ChildItem -Path src/**/*.csproj | Select-String "<MinVerTagPrefix>$minVerTagPrefix</MinVerTagPrefix>" -List | Select Path | Split-Path -Parent
+
+$path = "\.publicApi\**\PublicAPI.Shipped.txt";
+
+foreach ($projectDir in $projectDirs) {
+    $searchPath = Join-Path -Path $projectDir -ChildPath $path;
+
+    Write-Host "Search glob: $searchPath";
+
+    Get-ChildItem -Path $searchPath -Recurse |
+        ForEach-Object {
+            Write-Host "Shipped: $_";
+
+            [string]$shipped = $_.FullName;
+            [string]$unshipped = $shipped -replace ".shipped.txt", ".Unshipped.txt";
+
+            if (Test-Path $unshipped) {
+                Write-Host "Unshipped: $unshipped";
+
+                Get-Content $shipped, $unshipped |  # get contents of both text files
+                    Where-Object {$_ -ne ""} |      # filter empty lines
+                    Sort-Object |                   # sort lines
+                    Get-Unique |                    # filter duplicates
+                    Set-Content $shipped;           # write to shipped.txt
+
+                Clear-Content $unshipped;           # empty unshipped.txt
+
+                Write-Host "...MERGED and SORTED";
+            }
+
+            Write-Host "";
+        }
+}

build/scripts/post-release.psm1

@@ -0,0 +1,598 @@
+function CreateDraftRelease {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$tag,
+    [Parameter()][string]$releaseFiles
+  )
+
+  $match = [regex]::Match($tag, '^(.*?-)(.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse prefix or version from tag'
+  }
+
+  $tagPrefix = $match.Groups[1].Value
+  $version = $match.Groups[2].Value
+  $isPrerelease = $version -match '-alpha' -or $version -match '-beta' -or $version -match '-rc'
+
+  $projects = @(Get-ChildItem -Path src/**/*.csproj | Select-String "<MinVerTagPrefix>$tagPrefix</MinVerTagPrefix>" -List | Select Path)
+
+  if ($projects.Length -eq 0)
+  {
+      throw 'No projects found with MinVerTagPrefix matching prefix from tag'
+  }
+
+  $notes = ''
+  $previousVersion = ''
+
+  foreach ($project in $projects)
+  {
+      $projectName = [System.IO.Path]::GetFileNameWithoutExtension($project.Path)
+
+      $changelogContent = Get-Content -Path "src/$projectName/CHANGELOG.md"
+
+      $started = $false
+      $content = ""
+
+      foreach ($line in $changelogContent)
+      {
+          if ($line -like "## $version" -and $started -ne $true)
+          {
+              $started = $true
+          }
+          elseif ($line -like "Released *" -and $started -eq $true)
+          {
+              continue
+          }
+          elseif ($line -like "## *" -and $started -eq $true)
+          {
+              $match = [regex]::Match($line, '^##\s*(.*)$')
+              if ($match.Success -eq $true)
+              {
+                  $previousVersion = $match.Groups[1].Value
+              }
+              break
+          }
+          else
+          {
+              if ($started -eq $true -and ([string]::IsNullOrWhitespace($line) -eq $false -or $content.Length -gt 0))
+              {
+                  $content += "  " + $line + "`r`n"
+              }
+          }
+      }
+
+      if ([string]::IsNullOrWhitespace($content) -eq $true)
+      {
+          $content = "  No notable changes."
+      }
+
+      $content = $content.trimend()
+
+      $notes +=
+@"
+* NuGet: [$projectName v$version](https://www.nuget.org/packages/$projectName/$version)
+
+$content
+
+  See [CHANGELOG](https://github.com/$gitRepository/blob/$tag/src/$projectName/CHANGELOG.md) for details.
+
+
+"@
+  }
+
+  if ($isPrerelease -eq $true)
+  {
+    $notes =
+@"
+The following changes are from the previous release [$previousVersion](https://github.com/$gitRepository/releases/tag/$tagPrefix$previousVersion).
+
+
+"@ + $notes
+
+    gh release create $tag $releaseFiles `
+      --title $tag `
+      --verify-tag `
+      --notes $notes `
+      --prerelease `
+      --draft
+  }
+  else
+  {
+    $notes =
+@"
+For highlights and announcements pertaining to this release see: [Release Notes > $version](https://github.com/$gitRepository/blob/main/RELEASENOTES.md#$($version.Replace('.',''))).
+
+The following changes are from the previous release [$previousVersion](https://github.com/$gitRepository/releases/tag/$tagPrefix$previousVersion).
+
+
+"@ + $notes
+
+    gh release create $tag $releaseFiles `
+      --title $tag `
+      --verify-tag `
+      --notes $notes `
+      --latest `
+      --draft
+  }
+}
+
+Export-ModuleMember -Function CreateDraftRelease
+
+function TryPostPackagesReadyNoticeOnPrepareReleasePullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$tag,
+    [Parameter(Mandatory=$true)][string]$tagSha,
+    [Parameter(Mandatory=$true)][string]$packagesUrl,
+    [Parameter(Mandatory=$true)][string]$botUserName
+  )
+
+  $prListResponse = gh pr list --search $tagSha --state merged --json number,author,title,comments | ConvertFrom-Json
+
+  if ($prListResponse.Length -eq 0)
+  {
+    Write-Host 'No prepare release PR found for tag & commit skipping post notice'
+    return
+  }
+
+  foreach ($pr in $prListResponse)
+  {
+    if ($pr.author.login -ne $botUserName -or $pr.title -ne "[release] Prepare release $tag")
+    {
+      continue
+    }
+
+    $foundComment = $false
+    foreach ($comment in $pr.comments)
+    {
+      if ($comment.author.login -eq $botUserName -and $comment.body.StartsWith("I just pushed the [$tag]"))
+      {
+        $foundComment = $true
+        break
+      }
+    }
+
+    if ($foundComment -eq $false)
+    {
+      continue
+    }
+
+  $body =
+@"
+The packages for [$tag](https://github.com/$gitRepository/releases/tag/$tag) are now available: $packagesUrl.
+
+Once these packages have been validated have a maintainer post a comment with "/PushPackages" in the body if you would like me to push to NuGet.
+"@
+
+    $pullRequestNumber = $pr.number
+
+    gh pr comment $pullRequestNumber --body $body
+    return
+  }
+
+  Write-Host 'No prepare release PR found matched author and title with a valid comment'
+}
+
+Export-ModuleMember -Function TryPostPackagesReadyNoticeOnPrepareReleasePullRequest
+
+function PushPackagesPublishReleaseUnlockAndPostNoticeOnPrepareReleasePullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$pullRequestNumber,
+    [Parameter(Mandatory=$true)][string]$botUserName,
+    [Parameter(Mandatory=$true)][string]$commentUserName,
+    [Parameter(Mandatory=$true)][string]$artifactDownloadPath,
+    [Parameter(Mandatory=$true)][string]$pushToNuget
+  )
+
+  $prViewResponse = gh pr view $pullRequestNumber --json author,title,comments | ConvertFrom-Json
+
+  if ($prViewResponse.author.login -ne $botUserName)
+  {
+      throw 'PR author was unexpected'
+  }
+
+  $match = [regex]::Match($prViewResponse.title, '^\[release\] Prepare release (.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse tag from PR title'
+  }
+
+  $tag = $match.Groups[1].Value
+
+  $commentUserPermission = gh api "repos/$gitRepository/collaborators/$commentUserName/permission" | ConvertFrom-Json
+  if ($commentUserPermission.permission -ne 'admin')
+  {
+    gh pr comment $pullRequestNumber `
+      --body "I'm sorry @$commentUserName but you don't have permission to push packages. Only maintainers can push to NuGet."
+    return
+  }
+
+  $foundComment = $false
+  $packagesUrl = ''
+  foreach ($comment in $prViewResponse.comments)
+  {
+    if ($comment.author.login -eq $botUserName -and $comment.body.StartsWith("The packages for [$tag](https://github.com/$gitRepository/releases/tag/$tag) are now available:"))
+    {
+      $foundComment = $true
+      break
+    }
+  }
+
+  if ($foundComment -eq $false)
+  {
+    throw 'Could not find package push comment on pr'
+  }
+
+  gh release download $tag `
+    -p "$tag-packages.zip" `
+    -D "$artifactDownloadPath"
+
+  Expand-Archive -LiteralPath "$artifactDownloadPath/$tag-packages.zip" -DestinationPath "$artifactDownloadPath\"
+
+  if ($pushToNuget -eq 'true')
+  {
+    gh pr comment $pullRequestNumber `
+      --body "I am uploading the packages for ``$tag`` to NuGet and then I will publish the release."
+
+    nuget push "$artifactDownloadPath/**/*.nupkg" -Source https://api.nuget.org/v3/index.json -ApiKey "$env:NUGET_TOKEN" -SymbolApiKey "$env:NUGET_TOKEN"
+
+    if ($LASTEXITCODE -gt 0)
+    {
+      gh pr comment $pullRequestNumber `
+        --body "Something went wrong uploading the packages for ``$tag`` to NuGet."
+
+      throw 'nuget push failure'
+    }
+  }
+  else {
+    gh pr comment $pullRequestNumber `
+      --body "I am publishing the release without uploading the packages to NuGet because a token wasn't configured."
+  }
+
+  gh release edit $tag --draft=false
+
+  gh pr unlock $pullRequestNumber
+}
+
+Export-ModuleMember -Function PushPackagesPublishReleaseUnlockAndPostNoticeOnPrepareReleasePullRequest
+
+function CreateStableVersionUpdatePullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$tag,
+    [Parameter()][string]$targetBranch="main",
+    [Parameter()][string]$lineEnding="`n",
+    [Parameter()][string]$gitUserName,
+    [Parameter()][string]$gitUserEmail
+  )
+
+  $match = [regex]::Match($tag, '.*?-(.*)')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse version from tag'
+  }
+
+  $version = $match.Groups[1].Value
+
+  $branch="release/post-stable-${tag}-update"
+
+  if ([string]::IsNullOrEmpty($gitUserName) -eq $false)
+  {
+    git config user.name $gitUserName
+  }
+  if ([string]::IsNullOrEmpty($gitUserEmail) -eq $false)
+  {
+    git config user.email $gitUserEmail
+  }
+
+  git switch --create $branch origin/$targetBranch --no-track 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git switch failure'
+  }
+
+  $projectsAndDependenciesBefore = GetCoreDependenciesForProjects
+
+  (Get-Content Directory.Packages.props) `
+      -replace '<OTelLatestStableVer>.*<\/OTelLatestStableVer>', "<OTelLatestStableVer>$version</OTelLatestStableVer>" |
+    Set-Content Directory.Packages.props
+
+  $projectsAndDependenciesAfter = GetCoreDependenciesForProjects
+
+  $changedProjects = @{}
+
+  $projectsAndDependenciesBefore.GetEnumerator() | ForEach-Object {
+    $projectDir = $_.Key
+    $projectDependenciesBefore = $_.Value
+    $projectDependenciesAfter = $projectsAndDependenciesAfter[$projectDir]
+
+    $projectDependenciesBefore.GetEnumerator() | ForEach-Object {
+      $packageName = $_.Key
+      $packageVersionBefore = $_.Value
+      if ($projectDependenciesAfter[$packageName] -ne $packageVersionBefore)
+      {
+          $changedProjects[$projectDir] = $true
+      }
+    }
+  }
+
+  git add Directory.Packages.props 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git add failure'
+  }
+
+  git commit -m "Update OTelLatestStableVer in Directory.Packages.props to $version." 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git commit failure'
+  }
+
+  git push -u origin $branch 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git push failure'
+  }
+
+  $body =
+@"
+Note: This PR was opened automatically by the [post-release workflow](https://github.com/$gitRepository/actions/workflows/post-release.yml).
+
+Merge once packages are available on NuGet and the build passes.
+
+## Changes
+
+* Sets ``OTelLatestStableVer`` in ``Directory.Packages.props`` to ``$version``.
+"@
+
+  $createPullRequestResponse = gh pr create `
+    --title "[release] Core stable release $version updates" `
+    --body $body `
+    --base $targetBranch `
+    --head $branch `
+    --label release
+
+  Write-Host $createPullRequestResponse
+
+  $match = [regex]::Match($createPullRequestResponse, "\/pull\/(.*)$")
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse pull request number from gh pr create response'
+  }
+
+  $pullRequestNumber = $match.Groups[1].Value
+
+  if ($changedProjects.Count -eq 0)
+  {
+    Return
+  }
+
+  $entry = @"
+* Updated OpenTelemetry core component version(s) to ``$version``.
+  ([#$pullRequestNumber](https://github.com/$gitRepository/pull/$pullRequestNumber))
+
+
+"@
+
+  $lastLineBlank = $true
+  $changelogFilesUpdated = 0
+
+  foreach ($projectDir in $changedProjects.Keys)
+  {
+      $path = Join-Path -Path $projectDir -ChildPath "CHANGELOG.md"
+
+      if ([System.IO.File]::Exists($path) -eq $false)
+      {
+        Write-Host "No CHANGELOG found in $projectDir"
+        continue
+      }
+
+      $changelogContent = Get-Content -Path $path
+
+      $started = $false
+      $isRemoving = $false
+      $content = ""
+
+      foreach ($line in $changelogContent)
+      {
+          if ($line -like "## Unreleased" -and $started -ne $true)
+          {
+              $started = $true
+          }
+          elseif ($line -like "## *" -and $started -eq $true)
+          {
+              if ($lastLineBlank -eq $false)
+              {
+                  $content += $lineEnding
+              }
+              $content += $entry
+              $started = $false
+              $isRemoving = $false
+          }
+          elseif ($started -eq $true -and ($line -like '*Update* OpenTelemetry SDK version to*' -or $line -like '*Updated OpenTelemetry core component version(s) to*'))
+          {
+            $isRemoving = $true
+            continue
+          }
+
+          if ($line.StartsWith('* '))
+          {
+              if ($isRemoving -eq $true)
+              {
+                  $isRemoving = $false
+              }
+
+              if ($lastLineBlank -eq $false)
+              {
+                  $content += $lineEnding
+              }
+          }
+
+          if ($isRemoving -eq $true)
+          {
+              continue
+          }
+
+          $content += $line + $lineEnding
+
+          $lastLineBlank = [string]::IsNullOrWhitespace($line)
+      }
+
+      if ($started -eq $true)
+      {
+        # Note: If we never wrote the entry it means the file ended in the unreleased section
+        if ($lastLineBlank -eq $false)
+        {
+            $content += $lineEnding
+        }
+        $content += $entry
+      }
+
+      Set-Content -Path $path -Value $content.TrimEnd()
+
+      git add $path 2>&1 | % ToString
+      if ($LASTEXITCODE -gt 0)
+      {
+          throw 'git add failure'
+      }
+
+      $changelogFilesUpdated++
+  }
+
+  if ($changelogFilesUpdated -gt 0)
+  {
+    git commit -m "Update CHANGELOGs for projects using OTelLatestStableVer." 2>&1 | % ToString
+    if ($LASTEXITCODE -gt 0)
+    {
+        throw 'git commit failure'
+    }
+
+    git push -u origin $branch 2>&1 | % ToString
+    if ($LASTEXITCODE -gt 0)
+    {
+        throw 'git push failure'
+    }
+  }
+}
+
+Export-ModuleMember -Function CreateStableVersionUpdatePullRequest
+
+function GetCoreDependenciesForProjects {
+    $projects = @(Get-ChildItem -Path 'src/*/*.csproj')
+
+    $projectsAndDependencies = @{}
+
+    foreach ($project in $projects)
+    {
+        # Note: dotnet restore may fail if the core packages aren't available yet but that is fine, we just want to generate project.assets.json for these projects.
+        $output = dotnet restore $project -p:RunningDotNetPack=true
+
+        $projectDir = $project | Split-Path -Parent
+
+        $content = (Get-Content "$projectDir/obj/project.assets.json" -Raw)
+
+        $projectDependencies = @{}
+
+        $matches = [regex]::Matches($content, '"(OpenTelemetry(?:.*))?": {[\S\s]*?"target": "Package",[\S\s]*?"version": "(.*)"[\S\s]*?}')
+        foreach ($match in $matches)
+        {
+            $packageName = $match.Groups[1].Value
+            $packageVersion = $match.Groups[2].Value
+            if ($packageName -eq 'OpenTelemetry' -or
+                $packageName -eq 'OpenTelemetry.Api' -or
+                $packageName -eq 'OpenTelemetry.Api.ProviderBuilderExtensions' -or
+                $packageName -eq 'OpenTelemetry.Extensions.Hosting' -or
+                $packageName -eq 'OpenTelemetry.Extensions.Propagators')
+            {
+                $projectDependencies[$packageName.ToString()] = $packageVersion.ToString()
+            }
+        }
+        $projectsAndDependencies[$projectDir.ToString()] = $projectDependencies
+    }
+
+    return $projectsAndDependencies
+}
+
+function InvokeCoreVersionUpdateWorkflowInRemoteRepository {
+  param(
+    [Parameter(Mandatory=$true)][string]$remoteGitRepository,
+    [Parameter(Mandatory=$true)][string]$tag,
+    [Parameter()][string]$targetBranch="main"
+  )
+
+  $match = [regex]::Match($tag, '^(.*?-)(.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse prefix or version from tag'
+  }
+
+  gh workflow run "core-version-update.yml" `
+    --repo $remoteGitRepository `
+    --ref $targetBranch `
+    --field "tag=$tag"
+}
+
+Export-ModuleMember -Function InvokeCoreVersionUpdateWorkflowInRemoteRepository
+
+function TryPostReleasePublishedNoticeOnPrepareReleasePullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$botUserName,
+    [Parameter(Mandatory=$true)][string]$tag
+  )
+
+  $tagSha = git rev-list -n 1 $tag 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git rev-list failure'
+  }
+
+  $prListResponse = gh pr list --search $tagSha --state merged --json number,author,title,comments | ConvertFrom-Json
+
+  if ($prListResponse.Length -eq 0)
+  {
+    Write-Host 'No prepare release PR found for tag & commit skipping post notice'
+    return
+  }
+
+  foreach ($pr in $prListResponse)
+  {
+    if ($pr.author.login -ne $botUserName -or $pr.title -ne "[release] Prepare release $tag")
+    {
+      continue
+    }
+
+    $foundComment = $false
+    foreach ($comment in $pr.comments)
+    {
+      if ($comment.author.login -eq $botUserName -and $comment.body.StartsWith("The packages for [$tag](https://github.com/$gitRepository/releases/tag/$tag) are now available:"))
+      {
+        $foundComment = $true
+        break
+      }
+    }
+
+    if ($foundComment -eq $false)
+    {
+      continue
+    }
+
+  $body =
+@"
+The release [$tag](https://github.com/$gitRepository/releases/tag/$tag) has been published and packages should be available on NuGet momentarily.
+
+Have a nice day!
+"@
+
+    $pullRequestNumber = $pr.number
+
+    gh pr comment $pullRequestNumber --body $body
+    return
+  }
+
+  Write-Host 'No prepare release PR found matched author and title with a valid comment'
+}
+
+Export-ModuleMember -Function TryPostReleasePublishedNoticeOnPrepareReleasePullRequest

build/scripts/prepare-release.psm1

@@ -0,0 +1,463 @@
+function CreatePullRequestToUpdateChangelogsAndPublicApis {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$minVerTagPrefix,
+    [Parameter(Mandatory=$true)][string]$version,
+    [Parameter(Mandatory=$true)][string]$requestedByUserName,
+    [Parameter()][string]$targetBranch="main",
+    [Parameter()][string]$gitUserName,
+    [Parameter()][string]$gitUserEmail
+  )
+
+  $match = [regex]::Match($version, '^(\d+\.\d+\.\d+)(?:-((?:alpha)|(?:beta)|(?:rc))\.(\d+))?$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Input version did not match expected format'
+  }
+
+  $isPrerelease = $version -match '-alpha' -or $version -match '-beta' -or $version -match '-rc'
+  $tag="${minVerTagPrefix}${version}"
+  $branch="release/prepare-${tag}-release"
+
+  if ([string]::IsNullOrEmpty($gitUserName) -eq $false)
+  {
+    git config user.name $gitUserName
+  }
+  if ([string]::IsNullOrEmpty($gitUserEmail) -eq $false)
+  {
+    git config user.email $gitUserEmail
+  }
+
+  git switch --create $branch 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git switch failure'
+  }
+
+  $body =
+@"
+Note: This PR was opened automatically by the [prepare release workflow](https://github.com/$gitRepository/actions/workflows/prepare-release.yml).
+
+Requested by: @$requestedByUserName
+
+## Changes
+
+* CHANGELOG files updated for projects being released.
+"@
+
+  # Update CHANGELOGs
+  & ./build/scripts/update-changelogs.ps1 -minVerTagPrefix $minVerTagPrefix -version $version
+
+  # Update publicApi files for stable releases
+  if ($isPrerelease -ne $true)
+  {
+    & ./build/scripts/finalize-publicapi.ps1 -minVerTagPrefix $minVerTagPrefix
+
+    $body += "`r`n* Public API files updated for projects being released (only performed for stable releases)."
+  }
+
+  $body +=
+@"
+
+## Commands
+
+``/UpdateReleaseDates``: Use to update release dates in CHANGELOGs before merging [``approvers``, ``maintainers``]
+"@
+
+  if ($minVerTagPrefix -eq 'core-' -and $isPrerelease -ne $true)
+  {
+    $body +=
+@"
+
+``/UpdateReleaseNotes``: Use to update ``RELEASENOTES.md`` before merging [``approvers``, ``maintainers``]
+"@
+  }
+
+  $body +=
+@"
+
+``/CreateReleaseTag``: Use after merging to push the release tag and trigger the job to create packages [``approvers``, ``maintainers``]
+``/PushPackages``: Use after the created packages have been validated to push to NuGet [``maintainers``]
+"@
+
+  git commit -a -m "Prepare repo to release $tag." 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git commit failure'
+  }
+
+  git push -u origin $branch 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git push failure'
+  }
+
+  $createPullRequestResponse = gh pr create `
+    --title "[release] Prepare release $tag" `
+    --body $body `
+    --base $targetBranch `
+    --head $branch `
+    --label release
+
+  Write-Host $createPullRequestResponse
+
+  $match = [regex]::Match($createPullRequestResponse, "\/pull\/(.*)$")
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse pull request number from gh pr create response'
+  }
+
+  $pullRequestNumber = $match.Groups[1].Value
+
+  if ($minVerTagPrefix -eq 'core-' -and $isPrerelease -ne $true)
+  {
+    $found = Select-String -Path "RELEASENOTES.md" -Pattern "## $version" -Quiet
+    if ($found -eq $false)
+    {
+      $body =
+@"
+I noticed this PR is releasing a stable version of core packages but there isn't any content in ``RELEASENOTES.md`` for the version being released.
+
+It is important to update ``RELEASENOTES.md`` before creating the release tag because a permalink will become part of the package(s).
+
+Post a comment with "/UpdateReleaseNotes" in the body if you would like me to update release notes.
+
+Note: In the comment everything below "/UpdateReleaseNotes" will be added to ``RELEASENOTES.md`` for the version being released. If something is already there it will be replaced.
+"@
+
+      gh pr comment $pullRequestNumber --body $body
+    }
+  }
+}
+
+Export-ModuleMember -Function CreatePullRequestToUpdateChangelogsAndPublicApis
+
+function LockPullRequestAndPostNoticeToCreateReleaseTag {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$pullRequestNumber,
+    [Parameter(Mandatory=$true)][string]$botUserName
+  )
+
+  $prViewResponse = gh pr view $pullRequestNumber --json mergeCommit,author,title | ConvertFrom-Json
+
+  if ($prViewResponse.author.login -ne $botUserName)
+  {
+      throw 'PR author was unexpected'
+  }
+
+  $match = [regex]::Match($prViewResponse.title, '^\[release\] Prepare release (.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse tag from PR title'
+  }
+
+  $tag = $match.Groups[1].Value
+
+  $commit = $prViewResponse.mergeCommit.oid
+  if ([string]::IsNullOrEmpty($commit) -eq $true)
+  {
+      throw 'Could not find merge commit'
+  }
+
+  $body =
+@"
+I noticed this PR was merged.
+
+Post a comment with "/CreateReleaseTag" in the body if you would like me to create the release tag ``$tag`` for [the merge commit](https://github.com/$gitRepository/commit/$commit) which will trigger the package workflow.
+"@
+
+  gh pr comment $pullRequestNumber --body $body
+
+  gh pr lock $pullRequestNumber
+}
+
+Export-ModuleMember -Function LockPullRequestAndPostNoticeToCreateReleaseTag
+
+function CreateReleaseTagAndPostNoticeOnPullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$pullRequestNumber,
+    [Parameter(Mandatory=$true)][string]$botUserName,
+    [Parameter()][string]$gitUserName,
+    [Parameter()][string]$gitUserEmail
+  )
+
+  $prViewResponse = gh pr view $pullRequestNumber --json mergeCommit,author,title | ConvertFrom-Json
+
+  if ($prViewResponse.author.login -ne $botUserName)
+  {
+      throw 'PR author was unexpected'
+  }
+
+  $match = [regex]::Match($prViewResponse.title, '^\[release\] Prepare release (.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse tag from PR title'
+  }
+
+  $tag = $match.Groups[1].Value
+
+  $commit = $prViewResponse.mergeCommit.oid
+  if ([string]::IsNullOrEmpty($commit) -eq $true)
+  {
+      throw 'Could not find merge commit'
+  }
+
+  if ([string]::IsNullOrEmpty($gitUserName) -eq $false)
+  {
+    git config user.name $gitUserName
+  }
+  if ([string]::IsNullOrEmpty($gitUserEmail) -eq $false)
+  {
+    git config user.email $gitUserEmail
+  }
+
+  git tag -a $tag -m "$tag" $commit 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git tag failure'
+  }
+
+  git push origin $tag 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git push failure'
+  }
+
+  $body =
+@"
+I just pushed the [$tag](https://github.com/$gitRepository/releases/tag/$tag) tag.
+
+The [package workflow](https://github.com/$gitRepository/actions/workflows/publish-packages-1.0.yml) should begin momentarily.
+"@
+
+  gh pr comment $pullRequestNumber --body $body
+}
+
+Export-ModuleMember -Function CreateReleaseTagAndPostNoticeOnPullRequest
+
+function UpdateChangelogReleaseDatesAndPostNoticeOnPullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$pullRequestNumber,
+    [Parameter(Mandatory=$true)][string]$botUserName,
+    [Parameter(Mandatory=$true)][string]$commentUserName,
+    [Parameter()][string]$gitUserName,
+    [Parameter()][string]$gitUserEmail
+  )
+
+  $prViewResponse = gh pr view $pullRequestNumber --json headRefName,author,title | ConvertFrom-Json
+
+  if ($prViewResponse.author.login -ne $botUserName)
+  {
+      throw 'PR author was unexpected'
+  }
+
+  $match = [regex]::Match($prViewResponse.title, '^\[release\] Prepare release (.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse tag from PR title'
+  }
+
+  $tag = $match.Groups[1].Value
+
+  $match = [regex]::Match($tag, '^(.*?-)(.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse prefix or version from tag'
+  }
+
+  $tagPrefix = $match.Groups[1].Value
+  $version = $match.Groups[2].Value
+
+  $commentUserPermission = gh api "repos/$gitRepository/collaborators/$commentUserName/permission" | ConvertFrom-Json
+  if ($commentUserPermission.permission -ne 'admin' -and $commentUserPermission.permission -ne 'write')
+  {
+    gh pr comment $pullRequestNumber `
+      --body "I'm sorry @$commentUserName but you don't have permission to update this PR. Only maintainers and approvers can update this PR."
+    return
+  }
+
+  if ([string]::IsNullOrEmpty($gitUserName) -eq $false)
+  {
+    git config user.name $gitUserName
+  }
+  if ([string]::IsNullOrEmpty($gitUserEmail) -eq $false)
+  {
+    git config user.email $gitUserEmail
+  }
+
+  git switch $prViewResponse.headRefName 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git switch failure'
+  }
+
+  $updatedFiles = 0
+  $newHeader =
+@"
+## $version
+
+Released $(Get-Date -UFormat '%Y-%b-%d')
+"@
+
+  $projectDirs = Get-ChildItem -Path src/**/*.csproj | Select-String "<MinVerTagPrefix>$tagPrefix</MinVerTagPrefix>" -List | Select Path | Split-Path -Parent
+
+  foreach ($projectDir in $projectDirs)
+  {
+    $content = (Get-Content "$projectDir/CHANGELOG.md" -Raw)
+
+    $newContent = $content -replace "## $version\s*Released .*", $newHeader
+
+    if ($content -ne $newContent)
+    {
+      $updatedFiles++
+      Set-Content -Path "$projectDir/CHANGELOG.md" $newContent.Trim()
+    }
+  }
+
+  if ($updatedFiles -eq 0)
+  {
+    gh pr comment $pullRequestNumber --body "All of the CHANGELOG files have valid release dates."
+    return
+  }
+
+  git commit -a -m "Update CHANGELOG release dates for $tag." 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git commit failure'
+  }
+
+  git push -u origin $prViewResponse.headRefName 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git push failure'
+  }
+
+  gh pr comment $pullRequestNumber --body "I updated the CHANGELOG release dates."
+}
+
+Export-ModuleMember -Function UpdateChangelogReleaseDatesAndPostNoticeOnPullRequest
+
+function UpdateReleaseNotesAndPostNoticeOnPullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$pullRequestNumber,
+    [Parameter(Mandatory=$true)][string]$botUserName,
+    [Parameter(Mandatory=$true)][string]$commentUserName,
+    [Parameter(Mandatory=$true)][string]$commentBody,
+    [Parameter()][string]$gitUserName,
+    [Parameter()][string]$gitUserEmail
+  )
+
+  $prViewResponse = gh pr view $pullRequestNumber --json headRefName,author,title | ConvertFrom-Json
+
+  if ($prViewResponse.author.login -ne $botUserName)
+  {
+      throw 'PR author was unexpected'
+  }
+
+  $match = [regex]::Match($prViewResponse.title, '^\[release\] Prepare release (.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse tag from PR title'
+  }
+
+  $tag = $match.Groups[1].Value
+
+  $match = [regex]::Match($tag, '^(.*?-)(.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse prefix or version from tag'
+  }
+
+  $tagPrefix = $match.Groups[1].Value
+  $version = $match.Groups[2].Value
+  $isPrerelease = $version -match '-alpha' -or $version -match '-beta' -or $version -match '-rc'
+
+  $commentUserPermission = gh api "repos/$gitRepository/collaborators/$commentUserName/permission" | ConvertFrom-Json
+  if ($commentUserPermission.permission -ne 'admin' -and $commentUserPermission.permission -ne 'write')
+  {
+    gh pr comment $pullRequestNumber `
+      --body "I'm sorry @$commentUserName but you don't have permission to update this PR. Only maintainers and approvers can update this PR."
+    return
+  }
+
+  if ($tagPrefix -ne 'core-' -or $isPrerelease -eq $true)
+  {
+    gh pr comment $pullRequestNumber `
+      --body "I'm sorry @$commentUserName but we don't typically add release notes for prereleases or unstable packages."
+    return
+  }
+
+  if ([string]::IsNullOrEmpty($gitUserName) -eq $false)
+  {
+    git config user.name $gitUserName
+  }
+  if ([string]::IsNullOrEmpty($gitUserEmail) -eq $false)
+  {
+    git config user.email $gitUserEmail
+  }
+
+  git switch $prViewResponse.headRefName 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git switch failure'
+  }
+
+  $releaseNotesContent = (Get-Content -Path "RELEASENOTES.md" -Raw)
+
+  $match = [regex]::Match($commentBody, '[\w\W\s]*\/UpdateReleaseNotes.*$([\w\W\s]*)', [Text.RegularExpressions.RegexOptions]::Multiline)
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not find release notes content'
+  }
+
+  $content = $match.Groups[1].Value.Trim() -replace "`r`n", "`n"
+
+  $body =
+@"
+## $version
+
+Release details: [$version](https://github.com/$gitRepository/releases/tag/$tagPrefix$version)
+
+$content
+
+##
+"@
+
+  $match = [regex]::Match($releaseNotesContent, "(## $version[\w\W\s]*?)##", [Text.RegularExpressions.RegexOptions]::Multiline)
+  if ($match.Success -eq $true)
+  {
+    $content = [regex]::Replace($releaseNotesContent, "(## $version[\w\W\s]*?)##", $body, [Text.RegularExpressions.RegexOptions]::Multiline)
+    Set-Content -Path "RELEASENOTES.md" -Value $content.TrimEnd()
+  }
+  else {
+    $match = [regex]::Match($releaseNotesContent, '(# Release Notes[\w\W\s]*?)##', [Text.RegularExpressions.RegexOptions]::Multiline)
+    if ($match.Success -eq $false)
+    {
+      throw 'Could not find release notes header'
+    }
+
+    $body = $match.Groups[1].Value + $body
+    $content = [regex]::Replace($releaseNotesContent, '(# Release Notes[\w\W\s]*?)##', $body, [Text.RegularExpressions.RegexOptions]::Multiline)
+    Set-Content -Path "RELEASENOTES.md" -Value $content.TrimEnd()
+  }
+
+  git commit -a -m "Update RELEASENOTES for $tag." 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git commit failure'
+  }
+
+  git push -u origin $prViewResponse.headRefName 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git push failure'
+  }
+
+  gh pr comment $pullRequestNumber --body "I updated ``RELEASENOTES.md``."
+}
+
+Export-ModuleMember -Function UpdateReleaseNotesAndPostNoticeOnPullRequest

build/scripts/test-aot-compatibility.ps1

@@ -1,6 +1,7 @@
 param([string]$targetNetFramework)
 
-$rootDirectory = Split-Path $PSScriptRoot -Parent
+$rootDirectory = Get-Location
+
 $publishOutput = dotnet publish $rootDirectory/test/OpenTelemetry.AotCompatibility.TestApp/OpenTelemetry.AotCompatibility.TestApp.csproj --framework $targetNetFramework -nodeReuse:false /p:UseSharedCompilation=false /p:ExposeExperimentalFeatures=true
 
 $actualWarningCount = 0
@@ -23,10 +24,9 @@ if ($LastExitCode -ne 0)
     Write-Host $publishOutput
 }
 
-$runtime = $IsWindows ? "win-x64" : ($IsMacOS ? "macos-x64" : "linux-x64")
 $app = $IsWindows ? "./OpenTelemetry.AotCompatibility.TestApp.exe" : "./OpenTelemetry.AotCompatibility.TestApp"
 
-Push-Location $rootDirectory/test/OpenTelemetry.AotCompatibility.TestApp/bin/Release/$targetNetFramework/$runtime
+Push-Location $rootDirectory/artifacts/publish/OpenTelemetry.AotCompatibility.TestApp/release_$targetNetFramework
 
 Write-Host "Executing test App..."
 $app
@@ -43,7 +43,7 @@ $testPassed = 0
 if ($actualWarningCount -ne $expectedWarningCount)
 {
     $testPassed = 1
-    Write-Host "Actual warning count:", actualWarningCount, "is not as expected. Expected warning count is:", $expectedWarningCount
+    Write-Host "Actual warning count:", $actualWarningCount, "is not as expected. Expected warning count is:", $expectedWarningCount
 }
 
 Exit $testPassed

build/scripts/test-threadSafety.ps1

@@ -1,22 +1,32 @@
 param(
-  [Parameter()][string]$coyoteVersion="1.7.10",
+  [Parameter()][string]$coyoteVersion="1.7.11",
   [Parameter(Mandatory=$true)][string]$testProjectName,
   [Parameter(Mandatory=$true)][string]$targetFramework,
   [Parameter()][string]$categoryName="CoyoteConcurrencyTests",
   [Parameter()][string]$configuration="Release"
 )
 
+$ErrorActionPreference = "Stop"
+
 $env:OTEL_RUN_COYOTE_TESTS = 'true'
 
-$rootDirectory = Split-Path $PSScriptRoot -Parent
+$rootDirectory = Get-Location
 
 Write-Host "Install Coyote CLI."
-dotnet tool install --global Microsoft.Coyote.CLI
+dotnet tool install --global Microsoft.Coyote.CLI --version $coyoteVersion
+
+if ($LASTEXITCODE -ne 0) {
+    throw "Microsoft.Coyote.CLI installation failed with exit code $LASTEXITCODE"
+}
 
 Write-Host "Build $testProjectName project."
 dotnet build "$rootDirectory/test/$testProjectName/$testProjectName.csproj" --configuration $configuration
 
-$artifactsPath = Join-Path $rootDirectory "test/$testProjectName/bin/$configuration/$targetFramework"
+if ($LASTEXITCODE -ne 0) {
+    throw "dotnet build failed with exit code $LASTEXITCODE"
+}
+
+$artifactsPath = Join-Path $rootDirectory "artifacts/bin/$testProjectName/$($configuration.ToLowerInvariant())_$targetFramework"
 
 Write-Host "Generate Coyote rewriting options JSON file."
 $assemblies = Get-ChildItem $artifactsPath -Filter OpenTelemetry*.dll | ForEach-Object {$_.Name}
@@ -29,6 +39,13 @@ $RewriteOptionsJson | ConvertTo-Json -Compress | Set-Content -Path "$rootDirecto
 Write-Host "Run Coyote rewrite."
 coyote rewrite "$rootDirectory/test/$testProjectName/rewrite.coyote.json"
 
+if ($LASTEXITCODE -ne 0) {
+    throw "coyote rewrite failed with exit code $LASTEXITCODE"
+}
+
 Write-Host "Execute re-written binary."
 dotnet test "$artifactsPath/$testProjectName.dll" --framework $targetFramework --filter CategoryName=$categoryName
 
+if ($LASTEXITCODE -ne 0) {
+    throw "dotnet test failed with exit code $LASTEXITCODE"
+}

build/scripts/update-changelogs.ps1

@@ -0,0 +1,20 @@
+param(
+  [Parameter(Mandatory=$true)][string]$minVerTagPrefix,
+  [Parameter(Mandatory=$true)][string]$version
+)
+
+$projectDirs = Get-ChildItem -Path src/**/*.csproj | Select-String "<MinVerTagPrefix>$minVerTagPrefix</MinVerTagPrefix>" -List | Select Path | Split-Path -Parent
+
+$content = "Unreleased
+
+## $version
+
+Released $(Get-Date -UFormat '%Y-%b-%d')"
+
+foreach ($projectDir in $projectDirs) {
+  $path = Join-Path -Path $projectDir -ChildPath "CHANGELOG.md"
+
+  Write-Host "Updating $path"
+
+  (Get-Content -Path $path) -replace "Unreleased", $content | Set-Content -Path $path
+}

docs/Directory.Build.props

@@ -1,8 +1,11 @@
 <Project>
+  <Import Project="$([System.IO.Path]::Combine($(MSBuildThisFileDirectory), '..', 'Directory.Build.props'))" />
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildProjectDirectory), 'OpenTelemetry.sln'))\build\Common.nonprod.props" />
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFrameworks>$(TargetFrameworksForDocs)</TargetFrameworks>
+    <!-- Opt-out of Artifacts Output for docs as there are duplicated project names -->
+    <UseArtifactsOutput>false</UseArtifactsOutput>
   </PropertyGroup>
 </Project>

docs/README.md

@@ -0,0 +1,134 @@
+# OpenTelemetry .NET SDK
+
+## Initialize the SDK
+
+There are two different common initialization styles supported by OpenTelemetry.
+
+### Initialize the SDK using a host
+
+Users building applications based on
+[Microsoft.Extensions.Hosting](https://www.nuget.org/packages/Microsoft.Extensions.Hosting)
+should utilize the
+[OpenTelemetry.Extensions.Hosting](../src/OpenTelemetry.Extensions.Hosting/README.md)
+package to initialize OpenTelemetry. This style provides a deep integration
+between the host infrastructure (`IServiceCollection`, `IServiceProvider`,
+`IConfiguration`, etc.) and OpenTelemetry.
+
+[AspNetCore](https://learn.microsoft.com/aspnet/core/fundamentals/host/web-host)
+applications are the most common to use the hosting model but there is also a
+[Generic Host](https://learn.microsoft.com/dotnet/core/extensions/generic-host)
+which may be used in console, service, and worker applications.
+
+> [!NOTE]
+> When using `OpenTelemetry.Extensions.Hosting` only a single pipeline will be
+> created for each configured signal (logging, metrics, and/or tracing). Users
+> who need more granular control can create additional pipelines using the
+> manual style below.
+
+First install the
+[OpenTelemetry.Extensions.Hosting](../src/OpenTelemetry.Extensions.Hosting/README.md)
+package.
+
+Second call the `AddOpenTelemetry` extension using the host
+`IServiceCollection`:
+
+```csharp
+var builder = WebApplication.CreateBuilder(args);
+
+// Clear the default logging providers added by the host
+builder.Logging.ClearProviders();
+
+// Initialize OpenTelemetry
+builder.Services.AddOpenTelemetry()
+    .ConfigureResource(resource => /* Resource configuration goes here */)
+    .WithLogging(logging => /* Logging configuration goes here */)
+    .WithMetrics(metrics => /* Metrics configuration goes here */)
+    .WithTracing(tracing => /* Tracing configuration goes here */));
+```
+
+> [!NOTE]
+> Calling `WithLogging` automatically registers the OpenTelemetry
+> `ILoggerProvider` and enables `ILogger` integration.
+
+### Initialize the SDK manually
+
+Users running on .NET Framework or running without a host may initialize
+OpenTelemetry manually.
+
+> [!IMPORTANT]
+> When initializing OpenTelemetry manually make sure to ALWAYS dispose the SDK
+> and/or providers when the application is shutting down. Disposing
+> OpenTelemetry gives the SDK a chance to flush any telemetry held in memory.
+> Skipping this step may result in data loss.
+
+First install the [OpenTelemetry SDK](../src/OpenTelemetry/README.md) package or
+an exporter package such as
+[OpenTelemetry.Exporter.OpenTelemetryProtocol](../src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md).
+Exporter packages typically reference the SDK and will make it available via
+transitive reference.
+
+Second use one of the following initialization APIs (depending on the SDK
+version being used):
+
+#### Using 1.10.0 or newer
+
+The `OpenTelemetrySdk.Create` API can be used to initialize all signals off a
+single root builder and supports cross-cutting extensions such as
+`ConfigureResource` which configures a `Resource` to be used by all enabled
+signals. An `OpenTelemetrySdk` instance is returned which may be used to access
+providers for each signal. Calling `Dispose` on the returned instance will
+gracefully shutdown the SDK and flush any telemetry held in memory.
+
+> [!NOTE]
+> When calling `OpenTelemetrySdk.Create` a dedicated `IServiceCollection` and
+> `IServiceProvider` will be created for the SDK and shared by all signals. An
+> `IConfiguration` is created automatically from environment variables.
+
+```csharp
+using OpenTelemetry;
+
+var sdk = OpenTelemetrySdk.Create(builder => builder
+    .ConfigureResource(resource => /* Resource configuration goes here */)
+    .WithLogging(logging => /* Logging configuration goes here */)
+    .WithMetrics(metrics => /* Metrics configuration goes here */)
+    .WithTracing(tracing => /* Tracing configuration goes here */));
+
+// During application shutdown
+sdk.Dispose();
+```
+
+To obtain an `ILogger` instance for emitting logs when using the
+`OpenTelemetrySdk.Create` API call the `GetLoggerFactory` extension method using
+the returned `OpenTelemetrySdk` instance:
+
+```csharp
+var logger = sdk.GetLoggerFactory().CreateLogger<Program>();
+logger.LogInformation("Application started");
+```
+
+#### Using 1.9.0 or older
+
+The following shows how to create providers for each individual signal. Each
+provider is independent and must be managed and disposed explicitly. There is no
+mechanism using this style to perform cross-cutting actions across signals.
+
+```csharp
+using Microsoft.Extensions.Logging;
+using OpenTelemetry;
+
+var tracerProvider = Sdk.CreateTracerProviderBuilder()
+    /* Tracing configuration goes here */
+    .Build();
+
+var meterProvider = Sdk.CreateMeterProviderBuilder()
+    /* Metrics configuration goes here */
+    .Build();
+
+var loggerFactory = LoggerFactory.Create(builder => builder
+    .AddOpenTelemetry(options => /* Logging configuration goes here */));
+
+// During application shutdown
+tracerProvider.Dispose();
+meterProvider.Dispose();
+loggerFactory.Dispose();
+```

docs/diagnostics/experimental-apis/OTEL1000.md

@@ -4,11 +4,17 @@
 
 This is an Experimental API diagnostic covering the following APIs:
 
+* `ILoggingBuilder.UseOpenTelemetry`
+
+Experimental APIs may be changed or removed in the future.
+
+The following portions of `OTEL1000` were released stable in `1.9.0` and are no
+longer considered experimental:
+
 * `LoggerProviderBuilder`
 * `LoggerProvider`
 * `IDeferredLoggerProviderBuilder`
-
-Experimental APIs may be changed or removed in the future.
+* `OpenTelemetryBuilder.WithLogging`
 
 ## Details
 

docs/diagnostics/experimental-apis/OTEL1001.md

@@ -9,6 +9,7 @@ This is an Experimental API diagnostic covering the following APIs:
 * `LogRecordAttributeList`
 * `LogRecordData`
 * `LogRecordSeverity`
+* `Sdk.CreateLoggerProviderBuilder`
 
 Experimental APIs may be changed or removed in the future.
 

docs/diagnostics/experimental-apis/OTEL1002.md

@@ -1,30 +0,0 @@
-# OpenTelemetry .NET Diagnostic: OTEL1002
-
-## Overview
-
-This is an Experimental API diagnostic covering the following APIs:
-
-* `AlwaysOnExemplarFilter`
-* `AlwaysOffExemplarFilter`
-* `Exemplar`
-* `ExemplarFilter`
-* `MeterProviderBuilder.SetExemplarFilter` extension method
-* `TraceBasedExemplarFilter`
-
-Experimental APIs may be changed or removed in the future.
-
-## Details
-
-The OpenTelemetry Specification defines an [Exemplar
-API](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#exemplar)
-in the Metrics SDK.
-
-From the specification:
-
-> Exemplars are example data points for aggregated data. They provide specific
-> context to otherwise general aggregations. Exemplars allow correlation between
-> aggregated metric data and the original API calls where measurements are
-> recorded.
-
-We are exposing these APIs experimentally until the specification declares them
-stable.

docs/diagnostics/experimental-apis/OTEL1003.md

@@ -1,47 +0,0 @@
-# OpenTelemetry .NET Diagnostic: OTEL1003
-
-## Overview
-
-This is an Experimental API diagnostic covering the following API:
-
-* `MetricStreamConfiguration.CardinalityLimit.get`
-* `MetricStreamConfiguration.CardinalityLimit.set`
-
-Experimental APIs may be changed or removed in the future.
-
-## Details
-
-From the specification:
-
-> The cardinality limit for an aggregation is defined in one of three ways:
->
-> 1. A view with criteria matching the instrument an aggregation is created for
->    has an `aggregation_cardinality_limit` value defined for the stream, that
->    value SHOULD be used.
-> 2. If there is no matching view, but the `MetricReader` defines a default
->    cardinality limit value based on the instrument an aggregation is created
->    for, that value SHOULD be used.
-> 3. If none of the previous values are defined, the default value of 2000
->    SHOULD be used.
-
-We are exposing these APIs experimentally until the specification declares them
-stable.
-
-### Setting cardinality limit for a specific Metric via the View API
-
-The OpenTelemetry Specification defines the [cardinality
-limit](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#cardinality-limits)
-of a metric can be set by the matching view.
-
-```csharp
-using var meterProvider = Sdk.CreateMeterProviderBuilder()
-    .AddView(
-        instrumentName: "MyFruitCounter",
-        new MetricStreamConfiguration { CardinalityLimit = 10 })
-    .Build();
-```
-
-### Setting cardinality limit for a specific MetricReader
-
-[This is not currently supported by OpenTelemetry
-.NET.](https://github.com/open-telemetry/opentelemetry-dotnet/issues/5331)

docs/diagnostics/experimental-apis/OTEL1004.md

@@ -0,0 +1,62 @@
+# OpenTelemetry .NET Diagnostic: OTEL1004
+
+## Overview
+
+This is an Experimental API diagnostic covering the following APIs:
+
+* `ExemplarReservoir`
+* `FixedSizeExemplarReservoir`
+* `ExemplarMeasurement<T>`
+* `MetricStreamConfiguration.ExemplarReservoirFactory.get`
+* `MetricStreamConfiguration.ExemplarReservoirFactory.set`
+
+Experimental APIs may be changed or removed in the future.
+
+## Details
+
+The OpenTelemetry Specification defines an [ExemplarReservoir
+API](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#exemplarreservoir)
+and a mechanism for configuring `ExemplarReservoir` via the [View
+API](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#stream-configuration)
+in the Metrics SDK.
+
+From the specification:
+
+> The SDK MUST provide a mechanism for SDK users to provide their own
+> ExemplarReservoir implementation. This extension MUST be configurable on a
+> metric View, although individual reservoirs MUST still be instantiated per
+> metric-timeseries...
+
+We are exposing these APIs experimentally for the following reasons:
+
+* `FixedSizeExemplarReservoir` is not part of the spec. It is meant to help
+  custom reservoir authors and takes care of correctly creating & updating
+  `struct Exemplar`s (managing tag filtering when views are used), handles
+  `Exemplar` collection, and ensures all operations are safe to be called
+  concurrency (spec requirement). We want to see if this is helpful and meets
+  the needs of users.
+
+* There is currently no way to use
+  `MetricStreamConfiguration.ExemplarReservoirFactory` to switch a metric to a
+  different built-in reservoir (`AlignedHistogramBucketExemplarReservoir` or
+  `SimpleFixedSizeExemplarReservoir`). This is something supported by the spec
+  but we want to understand the use cases and needs before exposing these types.
+  Also it seems the default reservoirs may change.
+
+* There is currently no way to get access to the bucket index inside a reservoir
+  when a measurement is recorded against a histogram with explicit bounds. The
+  spec says the reservoir should calculate this given the
+  definition/configuration of the bounds but the SDK has already done this
+  computation. It seems unncessarily complicated to expose the configuration and
+  wasteful to do the work twice. We want to understand the types of algorithms
+  which users will want to implement before exposing something.
+
+**TL;DR** We want to gather feedback on the usability of the API and for the
+need(s) in general for custom reservoirs before exposing a stable API.
+
+## Provide feedback
+
+Please provide feedback on [this
+issue](https://github.com/open-telemetry/opentelemetry-dotnet/issues/5629) if
+you need stable support for custom `ExemplarReservoir`s. The feedback will help
+inform decisions about what to expose stable and when.

docs/diagnostics/experimental-apis/README.md

@@ -27,17 +27,11 @@ Description: Logs Bridge API
 
 Details: [OTEL1001](./OTEL1001.md)
 
-### OTEL1002
+### OTEL1004
 
-Description: Metrics Exemplar Support
+Description: ExemplarReservoir Support
 
-Details: [OTEL1002](./OTEL1002.md)
-
-### OTEL1003
-
-Description: MetricStreamConfiguration CardinalityLimit Support
-
-Details: [OTEL1003](./OTEL1003.md)
+Details: [OTEL1004](./OTEL1004.md)
 
 ## Inactive
 
@@ -51,4 +45,18 @@ Experimental APIs which have been released stable or removed:
     removed add details for alternative solution or reasoning.
 -->
 
-None
+### OTEL1002
+
+Description: Metrics Exemplar Support
+
+Details: [OTEL1002](https://github.com/open-telemetry/opentelemetry-dotnet/blob/b8ea807bae1a5d9b0f3d6d23b1e1e10f5e096a25/docs/diagnostics/experimental-apis/OTEL1002.md)
+
+Released stable: `1.9.0`
+
+### OTEL1003
+
+Description: MetricStreamConfiguration CardinalityLimit Support
+
+Details: [OTEL1003](https://github.com/open-telemetry/opentelemetry-dotnet/blob/9f41eadf03f3dcc5e76c686b61fb39849f046312/docs/diagnostics/experimental-apis/OTEL1003.md)
+
+Released stable: `1.10.0`

docs/logs/README.md

@@ -1,6 +1,5 @@
 # OpenTelemetry .NET Logs
 
-<!-- markdownlint-disable MD033 -->
 <details>
 <summary>Table of Contents</summary>
 
@@ -15,7 +14,6 @@
 * [Log Redaction](#log-redaction)
 
 </details>
-<!-- markdownlint-enable MD033 -->
 
 ## Best Practices
 
@@ -27,33 +25,17 @@ OpenTelemetry .NET:
 * [Getting Started - Console Application](./getting-started-console/README.md)
 * [Logging with Complex Objects](./complex-objects/README.md)
 
-## Structured Logging
+## Logging API
 
-:heavy_check_mark: You should use structured logging.
+### ILogger
 
-* Structured logging is more efficient than unstructured logging.
-  * Filtering and redaction can happen on individual key-value pairs instead of
-    the entire log message.
-  * Storage and indexing are more efficient.
-* Structured logging makes it easier to manage and consume logs.
+.NET supports high performance, structured logging via the
+[`Microsoft.Extensions.Logging.ILogger`](https://docs.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger)
+interface (including
+[`ILogger<TCategoryName>`](https://learn.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger-1))
+to help monitor application behavior and diagnose issues.
 
-:stop_sign: You should avoid string interpolation.
-
-> [!WARNING]
-> The following code has bad performance due to [string
-  interpolation](https://learn.microsoft.com/dotnet/csharp/tutorials/string-interpolation):
-
-```csharp
-var food = "tomato";
-var price = 2.99;
-
-logger.LogInformation($"Hello from {food} {price}.");
-```
-
-Refer to the [logging performance
-benchmark](../../test/Benchmarks/Logs/LogBenchmarks.cs) for more details.
-
-## Package Version
+#### Package Version
 
 :heavy_check_mark: You should always use the
 [`ILogger`](https://docs.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger)
@@ -71,16 +53,6 @@ package, regardless of the .NET runtime version being used:
   backward compatibility on `Microsoft.Extensions.Logging` even during major
   version bumps, so compatibility is not a concern here.
 
-## Logging API
-
-### ILogger
-
-.NET supports high performance, structured logging via the
-[`Microsoft.Extensions.Logging.ILogger`](https://docs.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger)
-interface (including
-[`ILogger<TCategoryName>`](https://learn.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger-1))
-to help monitor application behavior and diagnose issues.
-
 #### Get Logger
 
 In order to use the `ILogger` interface, you need to first get a logger. How to
@@ -127,7 +99,38 @@ are not super expensive, they still come with CPU and memory cost, and are meant
 to be reused throughout the application. Refer to the [logging performance
 benchmark](../../test/Benchmarks/Logs/LogBenchmarks.cs) for more details.
 
-#### Use Logger
+#### Write log messages
+
+:heavy_check_mark: You should use structured logging.
+
+* Structured logging is more efficient than unstructured logging.
+  * Filtering and redaction can happen on individual key-value pairs instead of
+    the entire log message.
+  * Storage and indexing are more efficient.
+* Structured logging makes it easier to manage and consume logs.
+
+```csharp
+var food = "tomato";
+var price = 2.99;
+
+logger.LogInformation("Hello from {food} {price}.", food, price);
+```
+
+:stop_sign: You should avoid string interpolation.
+
+> [!WARNING]
+> The following code has bad performance due to [string
+  interpolation](https://learn.microsoft.com/dotnet/csharp/tutorials/string-interpolation):
+
+```csharp
+var food = "tomato";
+var price = 2.99;
+
+logger.LogInformation($"Hello from {food} {price}.");
+```
+
+Refer to the [logging performance
+benchmark](../../test/Benchmarks/Logs/LogBenchmarks.cs) for more details.
 
 :heavy_check_mark: You should use [compile-time logging source
 generation](https://docs.microsoft.com/dotnet/core/extensions/logger-message-generator)
@@ -224,6 +227,111 @@ code is now depending on which logger is being enabled, not to mention the
 argument evaluation might have significant side effects that are now depending
 on the logging configuration.
 
+:heavy_check_mark: You should use a dedicated parameter to log exceptions when
+using the compile-time source generator.
+
+```csharp
+var food = "tomato";
+var price = 2.99;
+
+try
+{
+    // Execute some logic
+
+    logger.SayHello(food, price);
+}
+catch (Exception ex)
+{
+    logger.SayHelloFailure(ex, food, price);
+}
+
+internal static partial class LoggerExtensions
+{
+    [LoggerMessage(Level = LogLevel.Information, Message = "Hello from {food} {price}.")]
+    public static partial void SayHello(this ILogger logger, string food, double price);
+
+    [LoggerMessage(Level = LogLevel.Error, Message = "Could not say hello from {food} {price}.")]
+    public static partial void SayHelloFailure(this ILogger logger, Exception exception, string food, double price);
+}
+```
+
+> [!NOTE]
+> When using the compile-time source generator the first `Exception` parameter
+> detected is automatically given special handling. It **SHOULD NOT** be part of
+> the message template. For details see: [Log method
+> anatomy](https://learn.microsoft.com/dotnet/core/extensions/logger-message-generator#log-method-anatomy).
+
+:heavy_check_mark: You should use the dedicated overloads to log exceptions when
+using the logging extensions methods.
+
+```csharp
+var food = "tomato";
+var price = 2.99;
+
+try
+{
+    // Execute some logic
+
+    logger.LogInformation("Hello from {food} {price}.", food, price);
+}
+catch (Exception ex)
+{
+    logger.LogError(ex, "Could not say hello from {food} {price}.", food, price);
+}
+```
+
+:stop_sign: You should avoid adding exception details into the message template.
+
+You want to use the correct `Exception` APIs because the OpenTelemetry
+Specification [defines dedicated
+attributes](https://github.com/open-telemetry/semantic-conventions/blob/main/docs/exceptions/exceptions-logs.md)
+for `Exception` details. The following examples show what **NOT** to do. In
+these cases the details won't be lost, but the dedicated attributes also won't
+be added.
+
+```csharp
+var food = "tomato";
+var price = 2.99;
+
+try
+{
+    // Execute some logic
+
+    logger.SayHello(food, price);
+}
+catch (Exception ex)
+{
+    logger.SayHelloFailure(food, price, ex.Message);
+}
+
+internal static partial class LoggerExtensions
+{
+    [LoggerMessage(Level = LogLevel.Information, Message = "Hello from {food} {price}.")]
+    public static partial void SayHello(this ILogger logger, string food, double price);
+
+    // BAD - Exception should not be part of the message template. Use the dedicated parameter.
+    [LoggerMessage(Level = LogLevel.Error, Message = "Could not say hello from {food} {price} {message}.")]
+    public static partial void SayHelloFailure(this ILogger logger, string food, double price, string message);
+}
+```
+
+```csharp
+var food = "tomato";
+var price = 2.99;
+
+try
+{
+    // Execute some logic
+
+    logger.LogInformation("Hello from {food} {price}.", food, price);
+}
+catch (Exception ex)
+{
+    // BAD - Exception should not be part of the message template. Use the dedicated parameter.
+    logger.LogError("Could not say hello from {food} {price} {message}.", food, price, ex.Message);
+}
+```
+
 ## LoggerFactory
 
 In many cases, you can use [ILogger](#ilogger) without having to interact with

docs/logs/complex-objects/FoodRecallNotice.cs

@@ -1,7 +1,9 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-public class FoodRecallNotice
+namespace ComplexObjects;
+
+internal struct FoodRecallNotice
 {
     public string? BrandName { get; set; }
 

docs/logs/complex-objects/Program.cs

@@ -1,6 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
+using ComplexObjects;
 using Microsoft.Extensions.Logging;
 using OpenTelemetry.Logs;
 
@@ -34,5 +35,5 @@ internal static partial class LoggerExtensions
     [LoggerMessage(LogLevel.Critical)]
     public static partial void FoodRecallNotice(
         this ILogger logger,
-        [LogProperties(OmitReferenceName = true)] FoodRecallNotice foodRecallNotice);
+        [LogProperties(OmitReferenceName = true)] in FoodRecallNotice foodRecallNotice);
 }

docs/logs/complex-objects/README.md

@@ -30,16 +30,12 @@ dotnet add package Microsoft.Extensions.Telemetry.Abstractions
 Define a new complex data type, as shown in [FoodRecallNotice.cs](./FoodRecallNotice.cs):
 
 ```csharp
-public class FoodRecallNotice
+public struct FoodRecallNotice
 {
     public string? BrandName { get; set; }
-
     public string? ProductDescription { get; set; }
-
     public string? ProductType { get; set; }
-
     public string? RecallReasonDescription { get; set; }
-
     public string? CompanyName { get; set; }
 }
 ```
@@ -54,7 +50,7 @@ internal static partial class LoggerExtensions
     [LoggerMessage(LogLevel.Critical)]
     public static partial void FoodRecallNotice(
         this ILogger logger,
-        [LogProperties(OmitReferenceName = true)] FoodRecallNotice foodRecallNotice);
+        [LogProperties(OmitReferenceName = true)] in FoodRecallNotice foodRecallNotice);
 }
 ```
 

docs/logs/complex-objects/complex-objects.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Telemetry.Abstractions" />

docs/logs/correlation/Program.cs

@@ -7,7 +7,9 @@ using OpenTelemetry;
 using OpenTelemetry.Logs;
 using OpenTelemetry.Trace;
 
-public class Program
+namespace Correlation;
+
+internal sealed class Program
 {
     private static readonly ActivitySource MyActivitySource = new("MyCompany.MyProduct.MyLibrary");
 

docs/logs/customizing-the-sdk/README.md

@@ -14,9 +14,10 @@ TODO
 
 ### IncludeScopes
 
-A "[scope](https://docs.microsoft.com/dotnet/core/extensions/logging#log-scopes)"
-is an `ILogger` concept that can group a set of logical operations and attach
-data to each log created as part of a set.
+Log
+[scope](https://docs.microsoft.com/dotnet/core/extensions/logging#log-scopes) is
+an `ILogger` concept that can group a set of logical operations and attach data
+to each log created as part of a set.
 
 `IncludeScopes` is off by default. Setting this to `true` will include all
 scopes with the exported `LogRecord`. Consult the individual `Exporter`
@@ -24,6 +25,14 @@ docs to learn more about how scopes will be processed.
 
 See [Program.cs](Program.cs) for an example.
 
+> [!NOTE]
+> When using [`ILogger.BeginScope<TState>(TState
+state)`](https://learn.microsoft.com/dotnet/api/microsoft.extensions.logging.ilogger.beginscope),
+it is highly recommended to use `IReadOnlyList<KeyValue<string, object?>>` or
+`List<KeyValuePair<string, object?>>` as the `TState` for the best performance.
+When performance is not a critical requirement,
+`IEnumerable<KeyValuePair<string, object?>>` can be used.
+
 ### IncludeFormattedMessage
 
 `IncludeFormattedMessage` indicates if the `LogRecord.FormattedMessage` will be

docs/logs/dedicated-pipeline/DedicatedLogging/DedicatedLoggingServiceCollectionExtensions.cs

@@ -6,25 +6,30 @@ using OpenTelemetry.Logs;
 
 namespace DedicatedLogging;
 
-public static class DedicatedLoggingServiceCollectionExtensions
+internal static class DedicatedLoggingServiceCollectionExtensions
 {
     public static IServiceCollection AddDedicatedLogging(
         this IServiceCollection services,
         IConfiguration configuration,
-        Action<OpenTelemetryLoggerOptions> configureOpenTelemetry)
+        Action<LoggerProviderBuilder> configureOpenTelemetry)
     {
         ArgumentNullException.ThrowIfNull(configureOpenTelemetry);
 
-        services.TryAddSingleton(sp =>
+        services.TryAddSingleton(_ =>
         {
-            var loggerFactory = LoggerFactory.Create(builder =>
+            var services = new ServiceCollection();
+            services.AddLogging(builder =>
             {
                 builder.AddConfiguration(configuration);
 
-                builder.AddOpenTelemetry(configureOpenTelemetry);
+                builder.AddOpenTelemetry();
             });
 
-            return new DedicatedLoggerFactory(loggerFactory);
+            services.ConfigureOpenTelemetryLoggerProvider(configureOpenTelemetry);
+
+            var sp = services.BuildServiceProvider();
+
+            return new DedicatedLoggerFactory(sp);
         });
 
         services.TryAdd(ServiceDescriptor.Singleton(typeof(IDedicatedLogger<>), typeof(DedicatedLogger<>)));
@@ -54,11 +59,13 @@ public static class DedicatedLoggingServiceCollectionExtensions
 
     private sealed class DedicatedLoggerFactory : ILoggerFactory
     {
+        private readonly ServiceProvider serviceProvider;
         private readonly ILoggerFactory innerLoggerFactory;
 
-        public DedicatedLoggerFactory(ILoggerFactory loggerFactory)
+        public DedicatedLoggerFactory(ServiceProvider serviceProvider)
         {
-            this.innerLoggerFactory = loggerFactory;
+            this.serviceProvider = serviceProvider;
+            this.innerLoggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();
         }
 
         public void AddProvider(ILoggerProvider provider)
@@ -68,6 +75,6 @@ public static class DedicatedLoggingServiceCollectionExtensions
             => this.innerLoggerFactory.CreateLogger(categoryName);
 
         public void Dispose()
-            => this.innerLoggerFactory.Dispose();
+            => this.serviceProvider.Dispose();
     }
 }

docs/logs/dedicated-pipeline/DedicatedLogging/IDedicatedLogger.cs

@@ -3,10 +3,10 @@
 
 namespace DedicatedLogging;
 
-public interface IDedicatedLogger : ILogger
+internal interface IDedicatedLogger : ILogger
 {
 }
 
-public interface IDedicatedLogger<out TCategoryName> : IDedicatedLogger
+internal interface IDedicatedLogger<out TCategoryName> : IDedicatedLogger
 {
 }

docs/logs/dedicated-pipeline/Program.cs

@@ -8,18 +8,19 @@ var builder = WebApplication.CreateBuilder(args);
 
 builder.Logging.ClearProviders();
 
-builder.Logging.AddOpenTelemetry(options =>
-{
-    // Set up primary pipeline for common app logs
-    options.AddConsoleExporter();
-});
+builder.Services.AddOpenTelemetry()
+    .WithLogging(logging =>
+    {
+        // Set up primary pipeline for common app logs
+        logging.AddConsoleExporter();
+    });
 
 builder.Services.AddDedicatedLogging(
     builder.Configuration.GetSection("DedicatedLogging"), // Bind configuration for dedicated logging pipeline
-    options =>
+    logging =>
     {
         // Set up secondary pipeline for dedicated logs
-        options.AddConsoleExporter();
+        logging.AddConsoleExporter();
     });
 
 var app = builder.Build();

docs/logs/dedicated-pipeline/dedicated-pipeline.csproj

@@ -1,4 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <NoWarn>$(NoWarn);CA1812;CA2213</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Console\OpenTelemetry.Exporter.Console.csproj" />
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Extensions.Hosting\OpenTelemetry.Extensions.Hosting.csproj" />

docs/logs/extending-the-sdk/MyExporter.cs

@@ -5,7 +5,7 @@ using System.Text;
 using OpenTelemetry;
 using OpenTelemetry.Logs;
 
-internal class MyExporter : BaseExporter<LogRecord>
+internal sealed class MyExporter : BaseExporter<LogRecord>
 {
     private readonly string name;
 
@@ -59,6 +59,7 @@ internal class MyExporter : BaseExporter<LogRecord>
 
     protected override void Dispose(bool disposing)
     {
+        base.Dispose(disposing);
         Console.WriteLine($"{this.name}.Dispose({disposing})");
     }
 }

docs/logs/extending-the-sdk/MyProcessor.cs

@@ -4,7 +4,7 @@
 using OpenTelemetry;
 using OpenTelemetry.Logs;
 
-internal class MyProcessor : BaseProcessor<LogRecord>
+internal sealed class MyProcessor : BaseProcessor<LogRecord>
 {
     private readonly string name;
 
@@ -32,6 +32,7 @@ internal class MyProcessor : BaseProcessor<LogRecord>
 
     protected override void Dispose(bool disposing)
     {
+        base.Dispose(disposing);
         Console.WriteLine($"{this.name}.Dispose({disposing})");
     }
 }

docs/logs/extending-the-sdk/Program.cs

@@ -6,7 +6,7 @@ using OpenTelemetry;
 
 namespace ExtendingTheSdk;
 
-public class Program
+internal sealed class Program
 {
     public static void Main()
     {
@@ -29,16 +29,16 @@ public class Program
         // logger.LogInformation($"Hello from potato {0.99}.");
 
         // structured log with template
-        logger.LogInformation("Hello from {name} {price}.", "tomato", 2.99);
+        logger.LogInformation("Hello from {Name} {Price}.", "tomato", 2.99);
 
         // structured log with strong type
-        logger.LogInformation("{food}", new Food { Name = "artichoke", Price = 3.99 });
+        logger.LogInformation("{Food}", new Food { Name = "artichoke", Price = 3.99 });
 
         // structured log with anonymous type
-        logger.LogInformation("{food}", new { Name = "pumpkin", Price = 5.99 });
+        logger.LogInformation("{Food}", new { Name = "pumpkin", Price = 5.99 });
 
         // structured log with general type
-        logger.LogInformation("{food}", new Dictionary<string, object>
+        logger.LogInformation("{Food}", new Dictionary<string, object>
         {
             ["Name"] = "truffle",
             ["Price"] = 299.99,
@@ -48,11 +48,11 @@ public class Program
         using (logger.BeginScope("[operation]"))
         using (logger.BeginScope("[hardware]"))
         {
-            logger.LogError("{name} is broken.", "refrigerator");
+            logger.LogError("{Name} is broken.", "refrigerator");
         }
 
         // message will be redacted by MyRedactionProcessor
-        logger.LogInformation("OpenTelemetry {sensitiveString}.", "<secret>");
+        logger.LogInformation("OpenTelemetry {SensitiveString}.", "<secret>");
     }
 
     internal struct Food

docs/logs/extending-the-sdk/extending-the-sdk.csproj

@@ -1,4 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <NoWarn>$(NoWarn);CA2000;CA1848;CA1510;CA1305</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry\OpenTelemetry.csproj" />
   </ItemGroup>

docs/logs/getting-started-aspnetcore/Program.cs

@@ -6,25 +6,21 @@ using OpenTelemetry.Resources;
 
 var builder = WebApplication.CreateBuilder(args);
 
-// Remove default providers and add OpenTelemetry logging provider.
-// For instructional purposes only, disable the default .NET console logging provider to
-// use the verbose OpenTelemetry console exporter instead. For most development
-// and production scenarios the default console provider works well and there is no need to
+// For instructional purposes only, disable the default .NET logging providers.
+// We remove the console logging provider in this demo to use the verbose
+// OpenTelemetry console exporter instead. For most development and production
+// scenarios the default console provider works well and there is no need to
 // clear these providers.
 builder.Logging.ClearProviders();
 
-builder.Logging.AddOpenTelemetry(logging =>
-{
-    var resourceBuilder = ResourceBuilder
-        .CreateDefault()
-        .AddService(builder.Environment.ApplicationName);
-
-    logging.SetResourceBuilder(resourceBuilder)
-
-        // ConsoleExporter is used for demo purpose only.
-        // In production environment, ConsoleExporter should be replaced with other exporters (e.g. OTLP Exporter).
-        .AddConsoleExporter();
-});
+// Add OpenTelemetry logging provider by calling the WithLogging extension.
+builder.Services.AddOpenTelemetry()
+    .ConfigureResource(r => r.AddService(builder.Environment.ApplicationName))
+    .WithLogging(logging => logging
+        /* Note: ConsoleExporter is used for demo purpose only. In production
+           environment, ConsoleExporter should be replaced with other exporters
+           (e.g. OTLP Exporter). */
+        .AddConsoleExporter());
 
 var app = builder.Build();
 

docs/logs/redaction/MyRedactionProcessor.cs

@@ -15,18 +15,18 @@ internal sealed class MyRedactionProcessor : BaseProcessor<LogRecord>
         }
     }
 
-    internal sealed class MyClassWithRedactionEnumerator : IReadOnlyList<KeyValuePair<string, object>>
+    internal sealed class MyClassWithRedactionEnumerator : IReadOnlyList<KeyValuePair<string, object?>>
     {
-        private readonly IReadOnlyList<KeyValuePair<string, object>> state;
+        private readonly IReadOnlyList<KeyValuePair<string, object?>> state;
 
-        public MyClassWithRedactionEnumerator(IReadOnlyList<KeyValuePair<string, object>> state)
+        public MyClassWithRedactionEnumerator(IReadOnlyList<KeyValuePair<string, object?>> state)
         {
             this.state = state;
         }
 
         public int Count => this.state.Count;
 
-        public KeyValuePair<string, object> this[int index]
+        public KeyValuePair<string, object?> this[int index]
         {
             get
             {
@@ -34,14 +34,14 @@ internal sealed class MyRedactionProcessor : BaseProcessor<LogRecord>
                 var entryVal = item.Value?.ToString();
                 if (entryVal != null && entryVal.Contains("<secret>"))
                 {
-                    return new KeyValuePair<string, object>(item.Key, "newRedactedValueHere");
+                    return new KeyValuePair<string, object?>(item.Key, "newRedactedValueHere");
                 }
 
                 return item;
             }
         }
 
-        public IEnumerator<KeyValuePair<string, object>> GetEnumerator()
+        public IEnumerator<KeyValuePair<string, object?>> GetEnumerator()
         {
             for (var i = 0; i < this.Count; i++)
             {

docs/logs/redaction/redaction.csproj

@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <!-- this is temporary. will remove in future PR. -->
-    <Nullable>disable</Nullable>
+    <NoWarn>$(NoWarn);CA2213;CA1812;CA1307</NoWarn>
   </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Console\OpenTelemetry.Exporter.Console.csproj" />
   </ItemGroup>

docs/metrics/README.md

@@ -1,6 +1,5 @@
 # OpenTelemetry .NET Metrics
 
-<!-- markdownlint-disable MD033 -->
 <details>
 <summary>Table of Contents</summary>
 
@@ -11,14 +10,15 @@
   * [Instruments](#instruments)
 * [MeterProvider Management](#meterprovider-management)
 * [Memory Management](#memory-management)
+  * [Example](#example)
   * [Pre-Aggregation](#pre-aggregation)
   * [Cardinality Limits](#cardinality-limits)
   * [Memory Preallocation](#memory-preallocation)
 * [Metrics Correlation](#metrics-correlation)
 * [Metrics Enrichment](#metrics-enrichment)
+* [Common issues that lead to missing metrics](#common-issues-that-lead-to-missing-metrics)
 
 </details>
-<!-- markdownlint-enable MD033 -->
 
 ## Best Practices
 
@@ -59,7 +59,7 @@ too frequently. `Meter` is fairly expensive and meant to be reused throughout
 the application. For most applications, it can be modeled as static readonly
 field (e.g. [Program.cs](./getting-started-console/Program.cs)) or singleton via
 dependency injection (e.g.
-[Instrumentation.cs](../../examples/AspNetCore/Instrumentation.cs)).
+[InstrumentationSource.cs](../../examples/AspNetCore/InstrumentationSource.cs)).
 
 :heavy_check_mark: You should use dot-separated
 [UpperCamelCase](https://en.wikipedia.org/wiki/Camel_case) as the
@@ -88,7 +88,7 @@ static readonly Meter MyMeter = new("MyCompany.MyProduct.MyLibrary", "1.0");
   | [Asynchronous Gauge](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#asynchronous-gauge) | [`ObservableGauge<T>`](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.observablegauge-1) |
   | [Asynchronous UpDownCounter](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#asynchronous-updowncounter) | [`ObservableUpDownCounter<T>`](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.observableupdowncounter-1) |
   | [Counter](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#counter) | [`Counter<T>`](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.counter-1) |
-  | [Gauge](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#gauge) (experimental) | N/A |
+  | [Gauge](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#gauge) | [`Gauge<T>`](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.gauge-1) |
   | [Histogram](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#histogram) | [`Histogram<T>`](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.histogram-1) |
   | [UpDownCounter](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#updowncounter) | [`UpDownCounter<T>`](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.updowncounter-1) |
 
@@ -97,7 +97,7 @@ frequently. Instruments are fairly expensive and meant to be reused throughout
 the application. For most applications, instruments can be modeled as static
 readonly fields (e.g. [Program.cs](./getting-started-console/Program.cs)) or
 singleton via dependency injection (e.g.
-[Instrumentation.cs](../../examples/AspNetCore/Instrumentation.cs)).
+[InstrumentationSource.cs](../../examples/AspNetCore/InstrumentationSource.cs)).
 
 :stop_sign: You should avoid invalid instrument names.
 
@@ -129,7 +129,7 @@ There are two different ways of passing tags to an instrument API:
 * Pass the tags directly to the instrument API:
 
   ```csharp
-  counter.Add(100, ("Key1", "Value1"), ("Key2", "Value2"));
+  counter.Add(100, new("Key1", "Value1"), new("Key2", "Value2"));
   ```
 
 * Use
@@ -388,37 +388,25 @@ and the `MetricStreamConfiguration.CardinalityLimit` setting. Refer to this
 [doc](../../docs/metrics/customizing-the-sdk/README.md#changing-the-cardinality-limit-for-a-metric)
 for more information.
 
-Given a metric, once the cardinality limit is reached, any new measurement which
-cannot be independently aggregated because of the limit will be dropped or
+As of `1.10.0` once a metric has reached the cardinality limit, any new
+measurement that could not be independently aggregated will be automatically
 aggregated using the [overflow
-attribute](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#overflow-attribute)
-(if enabled). When NOT using the overflow attribute feature a warning is written
-to the [self-diagnostic log](../../src/OpenTelemetry/README.md#self-diagnostics)
-the first time an overflow is detected for a given metric.
+attribute](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#overflow-attribute).
 
 > [!NOTE]
-> Overflow attribute was introduced in OpenTelemetry .NET
-  [1.6.0-rc.1](../../src/OpenTelemetry/CHANGELOG.md#160-rc1). It is currently an
-  experimental feature which can be turned on by setting the environment
-  variable `OTEL_DOTNET_EXPERIMENTAL_METRICS_EMIT_OVERFLOW_ATTRIBUTE=true`. Once
-  the [OpenTelemetry
-  Specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#overflow-attribute)
-  become stable, this feature will be turned on by default.
+> In SDK versions `1.6.0` - `1.9.0` the overflow attribute was an experimental
+  feature that could be enabled by setting the environment variable
+  `OTEL_DOTNET_EXPERIMENTAL_METRICS_EMIT_OVERFLOW_ATTRIBUTE=true`.
 
-When [Delta Aggregation
+As of `1.10.0` when [Delta Aggregation
 Temporality](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/data-model.md#temporality)
-is used, it is possible to choose a smaller cardinality limit by allowing the
-SDK to reclaim unused metric points.
+is used, it is possible to choose a smaller cardinality limit because the SDK
+will reclaim unused metric points.
 
 > [!NOTE]
-> Reclaim unused metric points feature was introduced in OpenTelemetry .NET
-  [1.7.0-alpha.1](../../src/OpenTelemetry/CHANGELOG.md#170-alpha1). It is
-  currently an experimental feature which can be turned on by setting the
-  environment variable
-  `OTEL_DOTNET_EXPERIMENTAL_METRICS_RECLAIM_UNUSED_METRIC_POINTS=true`. Once the
-  [OpenTelemetry
-  Specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#overflow-attribute)
-  become stable, this feature will be turned on by default.
+> In SDK versions `1.7.0` - `1.9.0`, metric point reclaim was an experimental
+  feature that could be enabled by setting the environment variable
+  `OTEL_DOTNET_EXPERIMENTAL_METRICS_RECLAIM_UNUSED_METRIC_POINTS=true`.
 
 ### Memory Preallocation
 

docs/metrics/customizing-the-sdk/Program.cs

@@ -8,7 +8,7 @@ using OpenTelemetry.Resources;
 
 namespace CustomizingTheSdk;
 
-public class Program
+internal static class Program
 {
     private static readonly Meter Meter1 = new("CompanyA.ProductA.Library1", "1.0");
     private static readonly Meter Meter2 = new("CompanyA.ProductB.Library2", "1.0");
@@ -29,28 +29,22 @@ public class Program
             .AddView(instrumentName: "MyCounter", name: "MyCounterRenamed")
 
             // Change Histogram boundaries using the Explicit Bucket Histogram aggregation.
-            .AddView(instrumentName: "MyHistogram", new ExplicitBucketHistogramConfiguration() { Boundaries = new double[] { 10, 20 } })
+            .AddView(instrumentName: "MyHistogram", new ExplicitBucketHistogramConfiguration() { Boundaries = [10.0, 20.0] })
 
             // Change Histogram to use the Base2 Exponential Bucket Histogram aggregation.
             .AddView(instrumentName: "MyExponentialBucketHistogram", new Base2ExponentialBucketHistogramConfiguration())
 
             // For the instrument "MyCounterCustomTags", aggregate with only the keys "tag1", "tag2".
-            .AddView(instrumentName: "MyCounterCustomTags", new MetricStreamConfiguration() { TagKeys = new string[] { "tag1", "tag2" } })
+            .AddView(instrumentName: "MyCounterCustomTags", new MetricStreamConfiguration() { TagKeys = ["tag1", "tag2"] })
 
             // Drop the instrument "MyCounterDrop".
             .AddView(instrumentName: "MyCounterDrop", MetricStreamConfiguration.Drop)
 
-            // Advanced selection criteria and config via Func<Instrument, MetricStreamConfiguration>
-            .AddView((instrument) =>
-            {
-                if (instrument.Meter.Name.Equals("CompanyA.ProductB.Library2") &&
-                    instrument.GetType().Name.Contains("Histogram"))
-                {
-                    return new ExplicitBucketHistogramConfiguration() { Boundaries = new double[] { 10, 20 } };
-                }
+            // Configure the Explicit Bucket Histogram aggregation with custom boundaries and new name.
+            .AddView(instrumentName: "histogramWithMultipleAggregations", new ExplicitBucketHistogramConfiguration() { Boundaries = [10.0, 20.0], Name = "MyHistogramWithExplicitHistogram" })
 
-                return null;
-            })
+            // Use Base2 Exponential Bucket Histogram aggregation and new name.
+            .AddView(instrumentName: "histogramWithMultipleAggregations", new Base2ExponentialBucketHistogramConfiguration() { Name = "MyHistogramWithBase2ExponentialBucketHistogram" })
 
             // An instrument which does not match any views
             // gets processed with default behavior. (SDK default)
@@ -82,6 +76,12 @@ public class Program
             exponentialBucketHistogram.Record(random.Next(1, 1000), new("tag1", "value1"), new("tag2", "value2"));
         }
 
+        var histogramWithMultipleAggregations = Meter1.CreateHistogram<long>("histogramWithMultipleAggregations");
+        for (int i = 0; i < 20000; i++)
+        {
+            histogramWithMultipleAggregations.Record(random.Next(1, 1000), new("tag1", "value1"), new("tag2", "value2"));
+        }
+
         var counterCustomTags = Meter1.CreateCounter<long>("MyCounterCustomTags");
         for (int i = 0; i < 20000; i++)
         {

docs/metrics/customizing-the-sdk/README.md

@@ -115,14 +115,9 @@ name starts with "Abc.".
 A
 [View](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#view)
 provides the ability to customize the metrics that are output by the SDK.
-Following sections explains how to use this feature. Each section has two code
-snippets. The first one uses an overload of `AddView` method that takes in the
-name of the instrument as the first parameter. The `View` configuration is then
-applied to the matching instrument name. The second code snippet shows how to
-use an advanced selection criteria to achieve the same results. This requires
-the user to provide a `Func<Instrument, MetricStreamConfiguration>` which offers
-more flexibility in filtering the instruments to which the `View` should be
-applied.
+Following sections explains how to use `AddView` method that takes the
+instrument name as the first parameter, the `View` configuration is then applied
+to the matching instrument name.
 
 #### Rename an instrument
 
@@ -136,20 +131,6 @@ own the instrument to create it with a different name.
     .AddView(instrumentName: "MyCounter", name: "MyCounterRenamed")
 ```
 
-```csharp
-    // Advanced selection criteria and config via Func<Instrument, MetricStreamConfiguration>
-    .AddView((instrument) =>
-    {
-        if (instrument.Meter.Name == "CompanyA.ProductB.LibraryC" &&
-            instrument.Name == "MyCounter")
-        {
-            return new MetricStreamConfiguration() { Name = "MyCounterRenamed" };
-        }
-
-        return null;
-    })
-```
-
 #### Drop an instrument
 
 When using `AddMeter` to add a Meter to the provider, all the instruments from
@@ -162,20 +143,6 @@ then it is recommended to simply not add that `Meter` using `AddMeter`.
     .AddView(instrumentName: "MyCounterDrop", MetricStreamConfiguration.Drop)
 ```
 
-```csharp
-    // Advanced selection criteria and config via Func<Instrument, MetricStreamConfiguration>
-    .AddView((instrument) =>
-    {
-        if (instrument.Meter.Name == "CompanyA.ProductB.LibraryC" &&
-            instrument.Name == "MyCounterDrop")
-        {
-            return MetricStreamConfiguration.Drop;
-        }
-
-        return null;
-    })
-```
-
 #### Select specific tags
 
 When recording a measurement from an instrument, all the tags that were provided
@@ -219,23 +186,6 @@ with the metric are of interest to you.
     ...
 ```
 
-```csharp
-    // Advanced selection criteria and config via Func<Instrument, MetricStreamConfiguration>
-    .AddView((instrument) =>
-    {
-        if (instrument.Meter.Name == "CompanyA.ProductB.LibraryC" &&
-            instrument.Name == "MyFruitCounter")
-        {
-            return new MetricStreamConfiguration
-            {
-                TagKeys = new string[] { "name" },
-            };
-        }
-
-        return null;
-    })
-```
-
 #### Configuring the aggregation of a Histogram
 
 There are two types of
@@ -250,47 +200,56 @@ used.
 
 ##### Explicit bucket histogram aggregation
 
-By default, the boundaries used for a Histogram are [`{ 0, 5, 10, 25, 50, 75,
-100, 250, 500, 750, 1000, 2500, 5000, 7500, 10000}`](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.14.0/specification/metrics/sdk.md#explicit-bucket-histogram-aggregation).
-Views can be used to provide custom boundaries for a Histogram. The measurements
-are then aggregated using the custom boundaries provided instead of the the
-default boundaries. This requires the use of
-`ExplicitBucketHistogramConfiguration`.
+By default, the [OpenTelemetry
+Specification](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.14.0/specification/metrics/sdk.md#explicit-bucket-histogram-aggregation)
+defines explicit buckets (aka boundaries) for Histograms as: `[ 0, 5, 10, 25,
+50, 75, 100, 250, 500, 750, 1000, 2500, 5000, 7500, 10000 ]`.
 
-```csharp
-    // Change Histogram boundaries to count measurements under the following buckets:
-    // (-inf, 10]
-    // (10, 20]
-    // (20, +inf)
-    .AddView(
-        instrumentName: "MyHistogram",
-        new ExplicitBucketHistogramConfiguration { Boundaries = new double[] { 10, 20 } })
+###### Customizing explicit buckets when using histogram aggregation
 
-    // If you provide an empty `double` array as `Boundaries` to the `ExplicitBucketHistogramConfiguration`,
-    // the SDK will only export the sum, count, min and max for the measurements.
-    // There are no buckets exported in this case.
-    .AddView(
-        instrumentName: "MyHistogram",
-        new ExplicitBucketHistogramConfiguration { Boundaries = Array.Empty<double>() })
-```
+There are two mechanisms available to configure explicit buckets when using
+histogram aggregation:
 
-```csharp
-    // Advanced selection criteria and config via Func<Instrument, MetricStreamConfiguration>
-    .AddView((instrument) =>
-    {
-        if (instrument.Meter.Name == "CompanyA.ProductB.LibraryC" &&
-            instrument.Name == "MyHistogram")
-        {
-            // `ExplicitBucketHistogramConfiguration` is a child class of `MetricStreamConfiguration`
-            return new ExplicitBucketHistogramConfiguration
-            {
-                Boundaries = new double[] { 10, 20 },
-            };
-        }
+* View API - Part of the OpenTelemetry .NET SDK.
+* Advice API - Part of the `System.Diagnostics.DiagnosticSource` package
+  starting with version `9.0.0`.
 
-        return null;
-    })
-```
+> [!IMPORTANT]
+> When both the View API and Advice API are used, the View API takes precedence.
+  If explicit buckets are not provided by either the View API or the Advice API
+  then the SDK defaults apply.
+
+* View API
+
+  Views can be used to provide custom explicit buckets for a Histogram. This
+  requires the use of `ExplicitBucketHistogramConfiguration`.
+
+  ```csharp
+   // Change Histogram boundaries to count measurements under the following buckets:
+   // (-inf, 10]
+   // (10, 20]
+   // (20, +inf)
+   .AddView(
+       instrumentName: "MyHistogram",
+       new ExplicitBucketHistogramConfiguration { Boundaries = new double[] { 10, 20 } })
+
+   // If you provide an empty `double` array as `Boundaries` to the `ExplicitBucketHistogramConfiguration`,
+   // the SDK will only export the sum, count, min and max for the measurements.
+   // There are no buckets exported in this case.
+   .AddView(
+       instrumentName: "MyHistogram",
+       new ExplicitBucketHistogramConfiguration { Boundaries = Array.Empty<double>() })
+  ```
+
+* Advice API
+
+  Starting with the `1.10.0` SDK, explicit buckets for a Histogram may be provided
+  by instrumentation authors when the instrument is created. This is generally
+  recommended to be used by library authors when the SDK defaults don't match the
+  required granularity for the histogram being emitted.
+
+  See: [Using Advice to customize Histogram
+  instruments](https://learn.microsoft.com/dotnet/core/diagnostics/metrics-instrumentation#using-advice-to-customize-histogram-instruments).
 
 ##### Base2 exponential bucket histogram aggregation
 
@@ -307,20 +266,94 @@ within the maximum number of buckets defined by `MaxSize`. The default
 `MaxSize` is 160 buckets and the default `MaxScale` is 20.
 
 ```csharp
-    // Change the maximum number of buckets
+    // Change the maximum number of buckets for "MyHistogram"
     .AddView(
         instrumentName: "MyHistogram",
         new Base2ExponentialBucketHistogramConfiguration { MaxSize = 40 })
 ```
 
+#### Produce multiple metrics from single instrument
+
+When an instrument matches multiple views, it can generate multiple metrics. For
+instance, if an instrument is matched by two different view configurations, it
+will result in two separate metrics being produced from that single instrument.
+Below is an example demonstrating how to leverage this capability to create two
+independent metrics from a single instrument. In this example, a histogram
+instrument is used to report measurements, and views are configured to produce
+two metrics : one aggregated using `ExplicitBucketHistogramConfiguration` and the
+other using `Base2ExponentialBucketHistogramConfiguration`.
+
 ```csharp
-    // Configure all histogram instruments to use the Base2 Exponential Histogram aggregation
-    .AddView((instrument) =>
-    {
-        return instrument.GetType().GetGenericTypeDefinition() == typeof(Histogram<>)
-            ? new Base2ExponentialBucketHistogramConfiguration()
-            : null;
-    })
+    var histogramWithMultipleAggregations = meter.CreateHistogram<long>("HistogramWithMultipleAggregations");
+
+    // Configure the Explicit Bucket Histogram aggregation with custom boundaries and new name.
+    .AddView(instrumentName: "HistogramWithMultipleAggregations", new ExplicitBucketHistogramConfiguration() { Boundaries = new double[] { 10, 20 }, Name = "MyHistogramWithExplicitHistogram" })
+
+    // Use Base2 Exponential Bucket Histogram aggregation and new name.
+    .AddView(instrumentName: "HistogramWithMultipleAggregations", new Base2ExponentialBucketHistogramConfiguration() { Name = "MyHistogramWithBase2ExponentialBucketHistogram" })
+
+    // Both views rename the metric to avoid name conflicts. However, in this case,
+    // renaming one would be sufficient.
+
+    // This measurement will be aggregated into two separate metrics.
+    histogramWithMultipleAggregations.Record(10, new("tag1", "value1"), new("tag2", "value2"));
+```
+
+When using views that produce multiple metrics from single instrument, it's
+crucial to rename the metric to prevent conflicts. In the event of conflict,
+OpenTelemetry will emit an internal warning but will still export both metrics.
+The impact of this behavior depends on the backend or receiver being used. You
+can refer to [OpenTelemetry's
+specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/data-model.md#opentelemetry-protocol-data-model-consumer-recommendations)
+for more details.
+
+Below example is showing the *BAD* practice. DO NOT FOLLOW it.
+
+```csharp
+    var histogram = meter.CreateHistogram<long>("MyHistogram");
+
+    // Configure a view to aggregate based only on the "location" tag.
+    .AddView(instrumentName: "MyHistogram", metricStreamConfiguration: new MetricStreamConfiguration
+        {
+            TagKeys = new string[] { "location" },
+        })
+
+    // Configure another view to aggregate based only on the "status" tag.
+    .AddView(instrumentName: "MyHistogram", metricStreamConfiguration: new MetricStreamConfiguration
+        {
+            TagKeys = new string[] { "status" },
+        })
+
+    // The measurement below will be aggregated into two metric streams, but both will have the same name.
+    // OpenTelemetry will issue a warning about this conflict and pass both streams to the exporter.
+    // However, this may cause issues depending on the backend.
+    histogram.Record(10, new("location", "seattle"), new("status", "OK"));
+```
+
+The modified version, avoiding name conflict is shown below:
+
+```csharp
+    var histogram = meter.CreateHistogram<long>("MyHistogram");
+
+    // Configure a view to aggregate based only on the "location" tag,
+    // and rename the metric.
+    .AddView(instrumentName: "MyHistogram", metricStreamConfiguration: new MetricStreamConfiguration
+        {
+            Name = "MyHistogramWithLocation",
+            TagKeys = new string[] { "location" },
+        })
+
+    // Configure a view to aggregate based only on the "status" tag,
+    // and rename the metric.
+    .AddView(instrumentName: "MyHistogram", metricStreamConfiguration: new MetricStreamConfiguration
+        {
+            Name = "MyHistogramWithStatus",
+            TagKeys = new string[] { "status" },
+        })
+
+    // The measurement below will be aggregated into two separate metrics, "MyHistogramWithLocation"
+    // and "MyHistogramWithStatus".
+    histogram.Record(10, new("location", "seattle"), new("status", "OK"));
 ```
 
 > [!NOTE]
@@ -329,6 +362,28 @@ by using Views.
 
 See [Program.cs](./Program.cs) for a complete example.
 
+#### Change the ExemplarReservoir
+
+> [!NOTE]
+> `MetricStreamConfiguration.ExemplarReservoirFactory` is an experimental API only
+  available in pre-release builds. For details see:
+  [OTEL1004](../../diagnostics/experimental-apis/OTEL1004.md).
+
+To set the [ExemplarReservoir](#exemplarreservoir) for an instrument, use the
+`MetricStreamConfiguration.ExemplarReservoirFactory` property on the View API:
+
+> [!IMPORTANT]
+> Setting `MetricStreamConfiguration.ExemplarReservoirFactory` alone will NOT
+  enable `Exemplar`s for an instrument. An [ExemplarFilter](#exemplarfilter)
+  MUST also be used.
+
+```csharp
+    // Use MyCustomExemplarReservoir for "MyFruitCounter"
+    .AddView(
+        instrumentName: "MyFruitCounter",
+        new MetricStreamConfiguration { ExemplarReservoirFactory = () => new MyCustomExemplarReservoir() })
+```
+
 ### Changing maximum Metric Streams
 
 Every instrument results in the creation of a single Metric stream. With Views,
@@ -375,9 +430,8 @@ metrics managed by a given `MeterProvider`, use the
 
 > [!CAUTION]
 > `MeterProviderBuilder.SetMaxMetricPointsPerMetricStream` is marked `Obsolete`
-  in pre-release builds and has been replaced by
-  `MetricStreamConfiguration.CardinalityLimit`. For details see:
-  [OTEL1003](../../diagnostics/experimental-apis/OTEL1003.md).
+  in stable builds since 1.10.0 and has been replaced by
+  `MetricStreamConfiguration.CardinalityLimit`.
 
 ```csharp
 using var meterProvider = Sdk.CreateMeterProviderBuilder()
@@ -393,11 +447,6 @@ To set the [cardinality limit](../README.md#cardinality-limits) for an
 individual metric, use the `MetricStreamConfiguration.CardinalityLimit` property
 on the View API:
 
-> [!NOTE]
-> `MetricStreamConfiguration.CardinalityLimit` is an experimental API only
-  available in pre-release builds. For details see:
-  [OTEL1003](../../diagnostics/experimental-apis/OTEL1003.md).
-
 ```csharp
 var meterProvider = Sdk.CreateMeterProviderBuilder()
     .AddMeter("MyCompany.MyProduct.MyLibrary")
@@ -430,19 +479,30 @@ tutorial](../exemplars/README.md) demonstrates how to use exemplars to achieve
 correlation from metrics to traces, which is one of the primary use cases for
 exemplars.
 
+#### Default behavior
+
+Exemplars in OpenTelemetry .NET are **off by default**
+(`ExemplarFilterType.AlwaysOff`). The [OpenTelemetry
+Specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#exemplarfilter)
+recommends Exemplars collection should be on by default
+(`ExemplarFilterType.TraceBased`) however there is a performance cost associated
+with Exemplars so OpenTelemetry .NET has taken a more conservative stance for
+its default behavior.
+
 #### ExemplarFilter
 
 `ExemplarFilter` determines which measurements are offered to the configured
 `ExemplarReservoir`, which makes the final decision about whether or not the
 offered measurement gets recorded as an `Exemplar`. Generally `ExemplarFilter`
-is a mechanism to control the overhead associated with `Exemplar` offering.
+is a mechanism to control the overhead associated with the offering and
+recording of `Exemplar`s.
 
-OpenTelemetry SDK comes with the following `ExemplarFilters` (defined on
+OpenTelemetry SDK comes with the following `ExemplarFilter`s (defined on
 `ExemplarFilterType`):
 
-* `AlwaysOff`: Makes no measurements eligible for becoming an `Exemplar`. Using
-  this is as good as turning off the `Exemplar` feature and is the current
-  default.
+* (Default behavior) `AlwaysOff`: Makes no measurements eligible for becoming an
+  `Exemplar`. Using this disables `Exemplar` collection and avoids all
+  performance costs associated with `Exemplar`s.
 * `AlwaysOn`: Makes all measurements eligible for becoming an `Exemplar`.
 * `TraceBased`: Makes those measurements eligible for becoming an `Exemplar`
   which are recorded in the context of a sampled `Activity` (span).
@@ -450,6 +510,9 @@ OpenTelemetry SDK comes with the following `ExemplarFilters` (defined on
 The `SetExemplarFilter` extension method on `MeterProviderBuilder` can be used
 to set the desired `ExemplarFilterType` and enable `Exemplar` collection:
 
+> [!NOTE]
+> The `SetExemplarFilter` API was added in the `1.9.0` release.
+
 ```csharp
 using OpenTelemetry;
 using OpenTelemetry.Metrics;
@@ -460,6 +523,24 @@ using var meterProvider = Sdk.CreateMeterProviderBuilder()
     .Build();
 ```
 
+It is also possible to configure the `ExemplarFilter` by using following
+environmental variables:
+
+> [!NOTE]
+> Programmatically calling `SetExemplarFilter` will override any defaults set
+  using environment variables or configuration.
+
+| Environment variable       | Description                                        | Notes |
+| -------------------------- | -------------------------------------------------- |-------|
+| `OTEL_METRICS_EXEMPLAR_FILTER` | Sets the default `ExemplarFilter` to use for all metrics. | Added in `1.9.0` |
+| `OTEL_DOTNET_EXPERIMENTAL_METRICS_EXEMPLAR_FILTER_HISTOGRAMS`        | Sets the default `ExemplarFilter` to use for histogram metrics. If set `OTEL_DOTNET_EXPERIMENTAL_METRICS_EXEMPLAR_FILTER_HISTOGRAMS` takes precedence over `OTEL_METRICS_EXEMPLAR_FILTER` for histogram metrics. | Experimental key (may be removed or changed in the future). Added in `1.9.0` |
+
+Allowed values:
+
+* `always_off`: Equivalent to `ExemplarFilterType.AlwaysOff`
+* `always_on`: Equivalent to `ExemplarFilterType.AlwaysOn`
+* `trace_based`: Equivalent to `ExemplarFilterType.TraceBased`
+
 #### ExemplarReservoir
 
 `ExemplarReservoir` receives the measurements sampled by the `ExemplarFilter`
@@ -467,19 +548,24 @@ and is responsible for recording `Exemplar`s. The following are the default
 reservoirs:
 
 * `AlignedHistogramBucketExemplarReservoir` is the default reservoir used for
-Histograms with buckets, and it stores at most one exemplar per histogram
-bucket. The exemplar stored is the last measurement recorded - i.e. any new
+Histograms with buckets, and it stores at most one `Exemplar` per histogram
+bucket. The `Exemplar` stored is the last measurement recorded - i.e. any new
 measurement overwrites the previous one in that bucket.
 
 * `SimpleFixedSizeExemplarReservoir` is the default reservoir used for all
-metrics except Histograms with buckets. It has a fixed reservoir pool, and
+metrics except histograms with buckets. It has a fixed reservoir pool, and
 implements the equivalent of [naive
 reservoir](https://en.wikipedia.org/wiki/Reservoir_sampling). The reservoir pool
-size (currently defaulting to 1) determines the maximum number of exemplars
-stored.
+size (currently defaulting to 1) determines the maximum number of `Exemplar`s
+stored. Exponential histograms use a `SimpleFixedSizeExemplarReservoir` with a
+pool size equal to the number of buckets up to a max of `20`.
 
-> [!NOTE]
-> Currently there is no ability to change or configure `ExemplarReservoir`.
+See [Change the ExemplarReservoir](#change-the-exemplarreservoir) for details on
+how to use the View API to change `ExemplarReservoir`s for an instrument.
+
+See [Building your own
+ExemplarReservoir](../extending-the-sdk/README.md#exemplarreservoir) for details
+on how to implement custom `ExemplarReservoir`s.
 
 ### Instrumentation
 

docs/metrics/customizing-the-sdk/customizing-the-sdk.csproj

@@ -1,4 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <NoWarn>$(NoWarn);CA5394</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Console\OpenTelemetry.Exporter.Console.csproj" />
   </ItemGroup>

docs/metrics/exemplars/Program.cs

@@ -0,0 +1,68 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+using System.Diagnostics;
+using System.Diagnostics.Metrics;
+using OpenTelemetry;
+using OpenTelemetry.Exporter;
+using OpenTelemetry.Metrics;
+using OpenTelemetry.Trace;
+
+namespace Exemplars;
+
+internal static class Program
+{
+    private static readonly ActivitySource MyActivitySource = new("OpenTelemetry.Demo.Exemplar");
+    private static readonly Meter MyMeter = new("OpenTelemetry.Demo.Exemplar");
+    private static readonly Histogram<double> MyHistogram = MyMeter.CreateHistogram<double>("MyHistogram");
+
+    public static void Main()
+    {
+        var tracerProvider = Sdk.CreateTracerProviderBuilder()
+            .AddSource("OpenTelemetry.Demo.Exemplar")
+            .AddOtlpExporter()
+            .Build();
+
+        var meterProvider = Sdk.CreateMeterProviderBuilder()
+            .AddMeter("OpenTelemetry.Demo.Exemplar")
+            .SetExemplarFilter(ExemplarFilterType.TraceBased)
+            .AddOtlpExporter((exporterOptions, metricReaderOptions) =>
+            {
+                exporterOptions.Endpoint = new Uri("http://localhost:9090/api/v1/otlp/v1/metrics");
+                exporterOptions.Protocol = OtlpExportProtocol.HttpProtobuf;
+                metricReaderOptions.PeriodicExportingMetricReaderOptions.ExportIntervalMilliseconds = 1000;
+            })
+            .Build();
+
+        var random = new Random();
+
+        Console.WriteLine("Press any key to exit");
+
+        while (!Console.KeyAvailable)
+        {
+            using (var parent = MyActivitySource.StartActivity("Parent Operation"))
+            {
+                parent?.SetTag("key1", "value1");
+                parent?.SetTag("key2", "value2");
+
+                using (var child = MyActivitySource.StartActivity("Child Operation"))
+                {
+                    child?.SetTag("key3", "value3");
+                    child?.SetTag("key4", "value4");
+
+                    MyHistogram.Record(random.NextDouble() * 100, new("tag1", "value1"), new("tag2", "value2"));
+                }
+            }
+
+            Thread.Sleep(300);
+        }
+
+        // Dispose meter provider before the application ends.
+        // This will flush the remaining metrics and shutdown the metrics pipeline.
+        meterProvider.Dispose();
+
+        // Dispose tracer provider before the application ends.
+        // This will flush the remaining spans and shutdown the tracing pipeline.
+        tracerProvider.Dispose();
+    }
+}

docs/metrics/exemplars/README.md

@@ -1,99 +1,166 @@
 # Using Exemplars in OpenTelemetry .NET
 
-Exemplars are example data points for aggregated data. They provide specific
-context to otherwise general aggregations. One common use case is to gain
-ability to correlate metrics to traces (and logs). While OpenTelemetry .NET
-supports Exemplars, it is only useful if the telemetry backend also supports the
-capabilities. This tutorial uses well known open source backends to demonstrate
-the concept. The following are the components involved:
+<details>
+<summary>Table of Contents</summary>
 
-* Test App - We use existing example app from the repo. This app is already
-instrumented with OpenTelemetry for logs, metrics and traces, and is configured
-to export them to the configured OTLP end point.
-* OpenTelemetry Collector - An instance of collector is run, which receives
-telemetry from the above app using OTLP. The collector then exports metrics to
-Prometheus, traces to Tempo.
-* Prometheus - Prometheus is used as the Metric backend.
-* Tempo - Tempo is used as the Tracing backend.
-* Grafana - UI to query metrics from Prometheus, traces from Tempo, and to
-  navigate between metrics and traces using Exemplar.
+* [Install and run Jaeger](#install-and-run-jaeger)
+* [Install and run Prometheus](#install-and-run-prometheus)
+* [Install and configure Grafana](#install-and-configure-grafana)
+* [Export metrics and traces from the
+  application](#export-metrics-and-traces-from-the-application)
+* [Use exemplars to navigate from metrics to
+  traces](#use-exemplars-to-navigate-from-metrics-to-traces)
+* [Learn more](#learn-more)
 
-All these components except the test app require additional configuration to
-enable Exemplar feature. To make it easy for users, these components are
-pre-configured to enable Exemplars, and a docker compose file is provided to
- spun them all up, in the required configurations.
+</details>
 
-## Pre-requisite
+[Exemplars](../customizing-the-sdk/README.md#exemplars) are example data points
+for aggregated data. They provide specific context to otherwise general
+aggregations. One common use case is to gain ability to correlate metrics to
+traces (and logs). While OpenTelemetry .NET supports Exemplars, it is only
+useful if the telemetry backend also supports the capabilities. This tutorial
+uses well known open-source backends to demonstrate the concept. The following
+components are involved:
 
-Install docker: <https://docs.docker.com/get-docker/>
+* [Program.cs](./Program.cs) - this application is instrumented with
+  OpenTelemetry, it sends metrics to Prometheus, and traces to Jaeger.
+* [Prometheus](#install-and-run-prometheus) - Prometheus is used as the metrics
+  backend.
+* [Jaeger](#install-and-run-jaeger) - Jaeger is used as the distributed tracing
+  backend.
+* [Grafana](#install-and-configure-grafana) - UI to query metrics from
+  Prometheus, traces from Jaeger, and to navigate between metrics and traces
+  using Exemplars.
 
-## Setup
+## Install and run Jaeger
 
-As mentioned in the intro, this tutorial uses OTel Collector, Prometheus, Tempo,
-and Grafana, and they must be up and running before proceeding. The following
-spins all of them with the correct configurations to support Exemplars.
+Download the [latest binary distribution
+archive](https://www.jaegertracing.io/download/) of Jaeger.
 
-Navigate to current directory and run the following:
+After finished downloading, extract it to a local location that's easy to
+access. Run the `jaeger-all-in-one(.exe)` executable:
 
 ```sh
-docker compose up -d
+./jaeger-all-in-one --collector.otlp.enabled
 ```
 
-If the above step succeeds, all dependencies would be spun up and ready now. To
-test, navigate to Grafana running at: `http://localhost:3000/`.
+## Install and run Prometheus
 
-## Run test app
+Follow the [first steps](https://prometheus.io/docs/introduction/first_steps/)
+to download the [latest release](https://prometheus.io/download/) of Prometheus.
 
-Now that the required dependencies are ready, lets run the demo app.
-This tutorial is using the existing ASP.NET Core app from the repo.
-
-Navigate to [Example Asp.Net Core App](../../../examples/AspNetCore/Program.cs)
-directory and run the following command:
+After finished downloading, extract it to a local location that's easy to
+access. Run the `prometheus(.exe)` server executable with feature flags
+[exemplars
+storage](https://prometheus.io/docs/prometheus/latest/feature_flags/#exemplars-storage)
+and
+[otlp-receiver](https://prometheus.io/docs/prometheus/latest/feature_flags/#otlp-receiver)
+enabled:
 
 ```sh
+./prometheus --enable-feature=exemplar-storage --web.enable-otlp-receiver
+```
+
+## Install and configure Grafana
+
+Follow the operating system specific instructions to [download and install
+Grafana](https://grafana.com/docs/grafana/latest/setup-grafana/installation/#supported-operating-systems).
+
+After installation, start the standalone Grafana server (`grafana-server.exe` or
+`./bin/grafana-server`, depending on the operating system). Then, use a
+[supported web
+browser](https://grafana.com/docs/grafana/latest/setup-grafana/installation/#supported-web-browsers)
+to navigate to [http://localhost:3000/](http://localhost:3000/).
+
+Follow the instructions in the Grafana getting started
+[doc](https://grafana.com/docs/grafana/latest/getting-started/getting-started/#step-2-log-in)
+to log in.
+
+After successfully logging in, hover on the Configuration icon
+on the panel at the left hand side, and click on Plugins.
+
+Find and click on the Jaeger plugin. Next click on `Create a Jaeger data source`
+button. Make the following changes:
+
+1. Set "URL" to `http://localhost:16686/`.
+2. At the bottom of the page click `Save & test` to ensure the data source is
+   working.
+
+![Add Jaeger data
+source](https://github.com/open-telemetry/opentelemetry-dotnet/assets/17327289/8356dc1d-dad2-4c82-9936-9a84b51d12fa)
+
+Find and click on the Prometheus plugin. Next click on
+`Create a Prometheus data source` button. Make the following changes:
+
+1. Set "URL" to `http://localhost:9090`.
+2. Under the "Exemplars" section, enable "Internal link", set "Data source" to
+   `Jaeger`, and set "Label name" to `trace_id`.
+3. At the bottom of the page click `Save & test` to ensure the data source is
+   working.
+
+![Add Prometheus data
+source](https://github.com/open-telemetry/opentelemetry-dotnet/assets/17327289/a137c4ac-dfd7-4d24-8811-208f66e67e37)
+
+## Export metrics and traces from the application
+
+Create a new console application and run it:
+
+```sh
+dotnet new console --output exemplars
+cd exemplars
 dotnet run
 ```
 
-Once the application is running, navigate to
-[http://localhost:5000/weatherforecast]("http://localhost:5000/weatherforecast")
-from a web browser. You may use the following Powershell script to generate load
-to the application.
+Add reference to [OTLP
+Exporter](../../../src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md):
 
-```powershell
-while($true)
-{
-    Invoke-WebRequest http://localhost:5000/weatherforecast
-    Start-Sleep -Milliseconds 500
-}
+```sh
+dotnet add package OpenTelemetry.Exporter.OpenTelemetryProtocol
 ```
 
-## Use Exemplars to navigate from Metrics to Traces
+Now copy the code from [Program.cs](./Program.cs) and run the application again.
+The application will start sending metrics to Prometheus and traces to Jaeger.
 
-The application sends metrics (with exemplars), and traces to the OTel
-Collector, which export metrics and traces to Prometheus and Tempo
-respectively.
+The application is configured with trace-based exemplar filter, which enables
+the OpenTelemetry SDK to attach exemplars to metrics:
 
-Please wait for 2 minutes before continuing so that enough data is generated
-and exported.
+```csharp
+var meterProvider = Sdk.CreateMeterProviderBuilder()
+    ...
+    .SetExemplarFilter(ExemplarFilterType.TraceBased)
+    ...
+```
+
+For more details about the `SetExemplarFilter` API see: [Customizing
+OpenTelemetry .NET SDK for Metrics >
+ExemplarFilter](../customizing-the-sdk/README.md#exemplarfilter).
+
+## Use exemplars to navigate from metrics to traces
 
 Open Grafana, select Explore, and select Prometheus as the source. Select the
-metric named "http_server_duration_bucket", and plot the chart. Toggle on the
-"Exemplar" option from the UI and hit refresh.
+metric named `MyHistogram_bucket`, and plot the chart. Toggle on the "Exemplars"
+option from the UI and hit refresh.
 
-![Enable Exemplar](https://user-images.githubusercontent.com/16979322/218627781-9886f837-11ae-4d52-94d3-f1821503209c.png)
+![Enable
+Exemplars](https://github.com/open-telemetry/opentelemetry-dotnet/assets/17327289/bc461c6d-a0b9-49b7-a91d-94b07c3f417f)
 
 The Exemplars appear as special "diamond shaped dots" along with the metric
-charts in the UI. Select any Exemplar to see the exemplar data, which includes
+charts in the UI. Select any exemplar to see the exemplar data, which includes
 the timestamp when the measurement was recorded, the raw value, and trace
 context when the recording was done. The "trace_id" enables jumping to the
-tracing backed (tempo). Click on the "Query with Tempo" button next to the
-"trace_id" field to open the corresponding `Trace` in Tempo.
+tracing backed (Jaeger in this case). Click on the "Query with Jaeger" button
+next to the "trace_id" field to open the corresponding trace in Jaeger.
 
-![Navigate to trace with exemplar](https://user-images.githubusercontent.com/16979322/218629999-1d1cd6ba-2385-4683-975a-d4797df8361a.png)
+![Navigate to trace with
+exemplar](https://github.com/open-telemetry/opentelemetry-dotnet/assets/17327289/56bb5297-f744-41f3-bc35-8596392b8673)
 
-## References
+## Learn more
 
-* [Exemplar specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#exemplar)
-* [Exemplars in Prometheus](https://prometheus.io/docs/prometheus/latest/feature_flags/#exemplars-storage)
-* [Exemplars in Grafana](https://grafana.com/docs/grafana/latest/fundamentals/exemplars/)
-* [Tempo](https://github.com/grafana/tempo)
+* [Exemplar
+  specification](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#exemplar)
+* [What is Prometheus?](https://prometheus.io/docs/introduction/overview/)
+* [Prometheus now supports OpenTelemetry
+  Metrics](https://horovits.medium.com/prometheus-now-supports-opentelemetry-metrics-83f85878e46a)
+* [Jaeger Tracing](https://www.jaegertracing.io/)
+* [Grafana support for
+  Prometheus](https://prometheus.io/docs/visualization/grafana/#creating-a-prometheus-graph)

docs/metrics/exemplars/exemplars.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <NoWarn>$(NoWarn);CA5394</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Exporter.OpenTelemetryProtocol\OpenTelemetry.Exporter.OpenTelemetryProtocol.csproj" />
+  </ItemGroup>
+</Project>

docs/metrics/extending-the-sdk/MyExporter.cs

@@ -5,7 +5,7 @@ using System.Text;
 using OpenTelemetry;
 using OpenTelemetry.Metrics;
 
-internal class MyExporter : BaseExporter<Metric>
+internal sealed class MyExporter : BaseExporter<Metric>
 {
     private readonly string name;
 
@@ -28,7 +28,7 @@ internal class MyExporter : BaseExporter<Metric>
                 sb.Append(", ");
             }
 
-            sb.Append($"{metric.Name}");
+            sb.Append(metric.Name);
 
             foreach (ref readonly var metricPoint in metric.GetMetricPoints())
             {
@@ -52,6 +52,7 @@ internal class MyExporter : BaseExporter<Metric>
 
     protected override void Dispose(bool disposing)
     {
+        base.Dispose(disposing);
         Console.WriteLine($"{this.name}.Dispose({disposing})");
     }
 }

docs/metrics/extending-the-sdk/Program.cs

@@ -8,7 +8,7 @@ using OpenTelemetry.Metrics;
 
 namespace ExtendingTheSdk;
 
-public class Program
+internal static class Program
 {
     private static readonly Meter MyMeter = new("MyCompany.MyProduct.MyLibrary", "1.0");
     private static readonly Counter<long> MyFruitCounter = MyMeter.CreateCounter<long>("MyFruitCounter");

docs/metrics/extending-the-sdk/README.md

@@ -2,7 +2,6 @@
 
 * [Building your own exporter](#exporter)
 * [Building your own reader](#reader)
-* [Building your own exemplar filter](#exemplarfilter)
 * [Building your own exemplar reservoir](#exemplarreservoir)
 * [Building your own resource detector](../../resources/README.md#resource-detector)
 * [References](#references)
@@ -72,12 +71,103 @@ to the `MeterProvider` as shown in the example [here](./Program.cs).
 
 Not supported.
 
-## ExemplarFilter
-
-Not supported.
-
 ## ExemplarReservoir
 
-Not supported.
+> [!NOTE]
+> `ExemplarReservoir` is an experimental API only available in pre-release
+  builds. For details see:
+  [OTEL1004](../../diagnostics/experimental-apis/OTEL1004.md). Please [provide
+  feedback](https://github.com/open-telemetry/opentelemetry-dotnet/issues/5629)
+  to help inform decisions about what should be exposed stable and when.
+
+Custom [ExemplarReservoir](../customizing-the-sdk/README.md#exemplarreservoir)s
+can be implemented to control how `Exemplar`s are recorded for a metric:
+
+* `ExemplarReservoir`s should derive from `FixedSizeExemplarReservoir` (which
+  belongs to the [OpenTelemetry](../../../src/OpenTelemetry/README.md) package)
+  and implement the `Offer` methods.
+* The `FixedSizeExemplarReservoir` constructor accepts a `capacity` parameter to
+  control the number of `Exemplar`s which may be recorded by the
+  `ExemplarReservoir`.
+* The `virtual` `OnCollected` method is called after the `ExemplarReservoir`
+  collection operation has completed and may be used to implement cleanup or
+  reset logic.
+* The `bool` `ResetOnCollect` property on `ExemplarReservoir` is set to `true`
+  when delta aggregation temporality is used for the metric using the
+  `ExemplarReservoir`.
+* The `Offer` and `Collect` `ExemplarReservoir` methods are called concurrently
+  by the OpenTelemetry SDK. As such any state required by custom
+  `ExemplarReservoir` implementations needs to be managed using appropriate
+  thread-safety/concurrency mechanisms (`lock`, `Interlocked`, etc.).
+* Custom `ExemplarReservoir` implementations MUST NOT throw exceptions.
+  Exceptions thrown in custom implementations MAY lead to unreleased locks and
+  undefined behaviors.
+
+The following example demonstrates a custom `ExemplarReservoir` implementation
+which records `Exemplar`s for measurements which have the highest value. When
+delta aggregation temporality is used the recorded `Exemplar` will be the
+highest value for a given collection cycle. When cumulative aggregation
+temporality is used the recorded `Exemplar` will be the highest value for the
+lifetime of the process.
+
+```csharp
+class HighestValueExemplarReservoir : FixedSizeExemplarReservoir
+{
+    private readonly object lockObject = new();
+    private long? previousValueLong;
+    private double? previousValueDouble;
+
+    public HighestValueExemplarReservoir()
+        : base(capacity: 1)
+    {
+    }
+
+    public override void Offer(in ExemplarMeasurement<long> measurement)
+    {
+        if (!this.previousValueLong.HasValue || measurement.Value > this.previousValueLong.Value)
+        {
+            lock (this.lockObject)
+            {
+                if (!this.previousValueLong.HasValue || measurement.Value > this.previousValueLong.Value)
+                {
+                    this.UpdateExemplar(0, in measurement);
+                    this.previousValueLong = measurement.Value;
+                }
+            }
+        }
+    }
+
+    public override void Offer(in ExemplarMeasurement<double> measurement)
+    {
+        if (!this.previousValueDouble.HasValue || measurement.Value > this.previousValueDouble.Value)
+        {
+            lock (this.lockObject)
+            {
+                if (!this.previousValueDouble.HasValue || measurement.Value > this.previousValueDouble.Value)
+                {
+                    this.UpdateExemplar(0, in measurement);
+                    this.previousValueDouble = measurement.Value;
+                }
+            }
+        }
+    }
+
+    protected override void OnCollected()
+    {
+        if (this.ResetOnCollect)
+        {
+            lock (this.lockObject)
+            {
+                this.previousValueLong = null;
+                this.previousValueDouble = null;
+            }
+        }
+    }
+}
+```
+
+Custom [ExemplarReservoir](../customizing-the-sdk/README.md#exemplarreservoir)s
+can be configured using the View API. For details see: [Change the
+ExemplarReservoir](../customizing-the-sdk/README.md#change-the-exemplarreservoir).
 
 ## References

docs/metrics/extending-the-sdk/extending-the-sdk.csproj

@@ -1,4 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <NoWarn>$(NoWarn);CA2000;CA1510;CA1305</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry\OpenTelemetry.csproj" />
   </ItemGroup>

docs/metrics/getting-started-aspnetcore/README.md

@@ -14,7 +14,7 @@ Install the
 [OpenTelemetry.Exporter.Console](../../../src/OpenTelemetry.Exporter.Console/README.md),
 [OpenTelemetry.Extensions.Hosting](../../../src/OpenTelemetry.Extensions.Hosting/README.md),
 and
-[OpenTelemetry.Instrumentation.AspNetCore](../../../src/OpenTelemetry.Exporter.Console/README.md)
+[OpenTelemetry.Instrumentation.AspNetCore](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/tree/main/src/OpenTelemetry.Instrumentation.AspNetCore/README.md)
 packages:
 
 ```sh
@@ -56,7 +56,7 @@ Congratulations! You are now collecting metrics using OpenTelemetry.
 What does the above program do?
 
 The program uses the
-[OpenTelemetry.Instrumentation.AspNetCore](../../../src/OpenTelemetry.Instrumentation.AspNetCore/README.md)
+[OpenTelemetry.Instrumentation.AspNetCore](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/tree/main/src/OpenTelemetry.Instrumentation.AspNetCore/README.md)
 package to automatically create metrics for incoming ASP.NET Core requests, uses
 the
 [OpenTelemetry.Exporter.Console](../../../src/OpenTelemetry.Exporter.Console/README.md)

docs/metrics/getting-started-aspnetcore/getting-started-aspnetcore.csproj

@@ -1,7 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
+  <ItemGroup>
+    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" />
+  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Console\OpenTelemetry.Exporter.Console.csproj" />
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Extensions.Hosting\OpenTelemetry.Extensions.Hosting.csproj" />
-    <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Instrumentation.AspNetCore\OpenTelemetry.Instrumentation.AspNetCore.csproj" />
   </ItemGroup>
 </Project>