nit(app): remove frivolous code (#4094)

this commit removes a piece of code that has been commented out.

it additionally removes a variable binding that is not needed. `dst` is
not moved, so we do not need to bind the address of the destination
service to a variable, nor do we need to clone it.

Signed-off-by: katelyn martin <kate@buoyant.io>

.devcontainer/devcontainer.json

@@ -3,7 +3,7 @@
 	"build": {
 		"dockerfile": "Dockerfile",
 		"args": {
-			"DEV_VERSION": "v45",
+			"DEV_VERSION": "v47",
 			"http_proxy": "${localEnv:http_proxy}",
 			"https_proxy": "${localEnv:https_proxy}"
 		}
@@ -23,7 +23,15 @@
 				"zxh404.vscode-proto3"
 			],
 			"settings": {
-				"files.insertFinalNewline": true
+				"files.insertFinalNewline": true,
+				"[git-commit]": {
+					"editor.rulers": [
+						72,
+						80
+					],
+					"editor.wordWrap": "wordWrapColumn",
+					"editor.wordWrapColumn": 80
+				}
 			}
 		}
 	},

.github/copilot-instructions.md

@@ -0,0 +1,156 @@
+# Linkerd2 Proxy Copilot Instructions
+
+## Code Generation
+
+- Code MUST pass `cargo fmt`.
+- Code MUST pass `cargo clippy --all-targets --all-features -- -D warnings`.
+- Markdown MUST pass `markdownlint-cli2`.
+- Prefer `?` for error propagation.
+- Avoid `unwrap()` and `expect()` outside tests.
+- Use `tracing` crate macros (`tracing::info!`, etc.) for structured logging.
+
+### Comments
+
+Comments should explain **why**, not **what**. Focus on high-level rationale and
+design intent at the function or block level, rather than line-by-line
+descriptions.
+
+- Use comments to capture:
+  - System-facing or interface-level concerns
+  - Key invariants, preconditions, and postconditions
+  - Design decisions and trade-offs
+  - Cross-references to architecture or design documentation
+- Avoid:
+  - Line-by-line commentary explaining obvious code
+  - Restating what the code already clearly expresses
+- For public APIs:
+  - Use `///` doc comments to describe the contract, behavior, parameters, and
+    usage examples
+- For internal rationale:
+  - Use `//` comments sparingly to note non-obvious reasoning or edge-case
+    handling
+- Be neutral and factual.
+
+### Rust File Organization
+
+For Rust source files, enforce this layout:
+
+1. **Non‑public imports**  
+   - Declare all `use` statements for private/internal crates first.  
+   - Group imports to avoid duplicates and do **not** add blank lines between
+     `use` statements.
+
+2. **Module declarations**  
+   - List all `mod` declarations.
+
+3. **Re‑exports**  
+   - Follow with `pub use` statements.
+
+4. **Type definitions**  
+   - Define `struct`, `enum`, `type`, and `trait` declarations.  
+   - Sort by visibility: `pub` first, then `pub(crate)`, then private.
+   - Public types should be documented with `///` comments.
+
+5. **Impl blocks**  
+   - Implement methods in the same order as types above.  
+   - Precede each type’s `impl` block with a header comment: `// === <TypeName> ===`
+
+6. **Tests**  
+   - End with a `tests` module guarded by `#[cfg(test)]`.
+   - If the in‑file test module exceeds 100 lines, move it to
+     `tests/<filename>.rs` as a child integration‑test module.
+
+## Test Generation
+
+- Async tests MUST use `tokio::test`.
+- Synchronous tests use `#[test]`.
+- Include at least one failing‑edge‑case test per public function.
+- Use `tracing::info!` for logging in tests, usually in place of comments.
+
+## Code Review
+
+### Rust
+
+- Point out any `unsafe` blocks and justify their safety.
+- Flag functions >50 LOC for refactor suggestions.
+- Highlight missing docs on public items.
+
+### Markdown
+
+- Use `markdownlint-cli2` to check for linting errors.
+- Lines SHOULD be wrapped at 80 characters.
+- Fenced code blocks MUST include a language identifier.
+
+### Copilot Instructions
+
+- Start each instruction with an imperative, present‑tense verb.
+- Keep each instruction under 120 characters.
+- Provide one directive per instruction; avoid combining multiple ideas.
+- Use "MUST" and "SHOULD" sparingly to emphasize critical rules.
+- Avoid semicolons and complex punctuation within bullets.
+- Do not reference external links, documents, or specific coding standards.
+
+## Commit Messages
+
+Commits follow the Conventional Commits specification:
+
+### Subject
+
+Subjects are in the form: `<type>[optional scope]: <description>`
+
+- **Type**: feat, fix, docs, refactor, test, chore, ci, build, perf, revert
+  (others by agreement)
+- **Scope**: optional, lowercase; may include `/` to denote sub‑modules (e.g.
+  `http/detect`)
+- **Description**: imperative mood, present tense, no trailing period
+- MUST be less than 72 characters
+- Omit needless words!
+
+### Body
+
+Non-trivial commits SHOULD include a body summarizing the change.
+
+- Explain *why* the change was needed.  
+- Describe *what* was done at a high level.
+- Use present-tense narration.
+- Use complete sentences, paragraphs, and punctuation.
+- Preceded by a blank line.
+- Wrapped at 80 characters.
+- Omit needless words!
+
+### Breaking changes
+
+If the change introduces a backwards-incompatible change, it MUST be marked as
+such.
+
+- Indicated by `!` after the type/scope (e.g. `feat(inbound)!: …`)  
+- Optionally including a `BREAKING CHANGE:` section in the footer explaining the
+  change in behavior.
+
+### Examples
+
+```text
+feat(auth): add JWT refresh endpoint
+
+There is currently no way to refresh a JWT token.
+
+This exposes a new `/refresh` route that returns a refreshed token.
+```
+
+```text
+feat(api)!: remove deprecated v1 routes
+
+The `/v1/*` endpoints have been deprecated for a long time and are no
+longer called by clients.
+
+This change removes the `/v1/*` endpoints and all associated code,
+including integration tests and documentation.
+
+BREAKING CHANGE: The previously-deprecated `/v1/*` endpoints were removed.
+```
+
+## Pull Requests
+
+- The subject line MUST be in the conventional commit format.
+- Auto‑generate a PR body summarizing the problem, solution, and verification steps.
+- List breaking changes under a separate **Breaking Changes** heading.

.github/dependabot.yml

@@ -44,6 +44,9 @@ updates:
           - "tokio-rustls"
           - "rustls*"
           - "ring"
+      symbolic:
+        patterns:
+          - "symbolic-*"
       tracing:
         patterns:
           - "tracing*"

.github/workflows/beta.yml

@@ -22,13 +22,13 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-24.04
-    container: ghcr.io/linkerd/dev:v45-rust
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
+    container: ghcr.io/linkerd/dev:v47-rust
     timeout-minutes: 20
     continue-on-error: true
     steps:
       - run: rustup toolchain install --profile=minimal beta
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: git config --global --add safe.directory "$PWD" # actions/runner#2033
       - run: just toolchain=beta fetch
       - run: just toolchain=beta build

.github/workflows/coverage.yml

@@ -21,9 +21,9 @@ env:
 jobs:
   meta:
     timeout-minutes: 5
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - id: changed
         uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c
         with:
@@ -40,19 +40,19 @@ jobs:
   codecov:
     needs: meta
     if: (github.event_name == 'push' && github.ref == 'refs/heads/main') || needs.meta.outputs.any_changed == 'true'
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     timeout-minutes: 30
     container:
-      image: docker://ghcr.io/linkerd/dev:v45-rust
+      image: docker://ghcr.io/linkerd/dev:v47-rust
       options: --security-opt seccomp=unconfined # 🤷
     env:
       CXX: "/usr/bin/clang++-19"
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: Swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0
       - run: cargo tarpaulin --locked --workspace --exclude=linkerd2-proxy --exclude=linkerd-transport-header --exclude=opencensus-proto --exclude=spire-proto --no-run
       - run: cargo tarpaulin --locked --workspace --exclude=linkerd2-proxy --exclude=linkerd-transport-header --exclude=opencensus-proto --exclude=spire-proto --skip-clean --ignore-tests --no-fail-fast --out=Xml
         # Some tests are especially flakey in coverage tests. That's fine. We
         # only really care to measure how much of our codebase is covered.
         continue-on-error: true
-      - uses: codecov/codecov-action@0565863a31f2c772f9f0395002a31e3f06189574
+      - uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24

.github/workflows/fuzzers.yml

@@ -26,11 +26,11 @@ permissions:
 jobs:
   list-changed:
     timeout-minutes: 3
-    runs-on: ubuntu-24.04
-    container: docker://rust:1.83.0
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
+    container: docker://rust:1.88.0
     steps:
       - run: apt update && apt install -y jo
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: git config --global --add safe.directory "$PWD" # actions/runner#2033
       - uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c
         id: changed-files
@@ -47,15 +47,15 @@ jobs:
   build:
     needs: [list-changed]
     timeout-minutes: 40
-    runs-on: ubuntu-24.04
-    container: docker://rust:1.83.0
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
+    container: docker://rust:1.88.0
     strategy:
       matrix:
         dir: ${{ fromJson(needs.list-changed.outputs.dirs) }}
     steps:
       - run: rustup toolchain add nightly
       - run: cargo install cargo-fuzz
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: git config --global --add safe.directory "$PWD" # actions/runner#2033
       - working-directory: ${{matrix.dir}}
         run: cargo +nightly fetch

.github/workflows/markdown.yml

@@ -12,9 +12,9 @@ on:
 jobs:
   markdownlint:
     timeout-minutes: 5
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: DavidAnson/markdownlint-cli2-action@05f32210e84442804257b2a6f20b273450ec8265
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: DavidAnson/markdownlint-cli2-action@992badcdf24e3b8eb7e87ff9287fe931bcb00c6e
         with:
             globs: "**/*.md"

.github/workflows/nightly.yml

@@ -22,13 +22,13 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-24.04
-    container: ghcr.io/linkerd/dev:v45-rust
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
+    container: ghcr.io/linkerd/dev:v47-rust
     timeout-minutes: 20
     continue-on-error: true
     steps:
       - run: rustup toolchain install --profile=minimal nightly
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: git config --global --add safe.directory "$PWD" # actions/runner#2033
       - run: just toolchain=nightly fetch
       - run: just toolchain=nightly profile=release build

.github/workflows/pr.yml

@@ -14,9 +14,9 @@ concurrency:
 jobs:
   meta:
     timeout-minutes: 5
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - id: build
         uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c
         with:
@@ -57,7 +57,7 @@ jobs:
   info:
     timeout-minutes: 3
     needs: meta
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
       - name: Info
         run: |
@@ -74,25 +74,25 @@ jobs:
   actions:
     needs: meta
     if: needs.meta.outputs.actions_changed == 'true'
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - uses: linkerd/dev/actions/setup-tools@v45
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: linkerd/dev/actions/setup-tools@v47
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: just action-lint
       - run: just action-dev-check
 
   rust:
     needs: meta
     if: needs.meta.outputs.cargo_changed == 'true' || needs.meta.outputs.rust_changed == 'true'
-    runs-on: ubuntu-24.04
-    container: ghcr.io/linkerd/dev:v45-rust
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
+    container: ghcr.io/linkerd/dev:v47-rust
     permissions:
       contents: read
     timeout-minutes: 20
     steps:
       - run: git config --global --add safe.directory "$PWD" # actions/runner#2033
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: Swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0
       - run: just fetch
       - run: cargo deny --all-features check bans licenses sources
       - run: just check-fmt
@@ -107,15 +107,15 @@ jobs:
     needs: meta
     if: needs.meta.outputs.cargo_changed == 'true'
     timeout-minutes: 20
-    runs-on: ubuntu-24.04
-    container: ghcr.io/linkerd/dev:v45-rust
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
+    container: ghcr.io/linkerd/dev:v47-rust
     strategy:
       matrix:
         crate: ${{ fromJson(needs.meta.outputs.cargo_crates) }}
     steps:
       - run: git config --global --add safe.directory "$PWD" # actions/runner#2033
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: Swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+      - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0
       - run: just fetch
       - run: just check-crate ${{ matrix.crate }}
 
@@ -123,11 +123,11 @@ jobs:
     needs: meta
     if: needs.meta.outputs.cargo_changed == 'true' || needs.meta.outputs.rust_changed == 'true'
     timeout-minutes: 20
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     env:
       WAIT_TIMEOUT: 2m
     steps:
-      - uses: linkerd/dev/actions/setup-tools@v45
+      - uses: linkerd/dev/actions/setup-tools@v47
       - name: scurl https://run.linkerd.io/install-edge | sh
         run: |
           scurl https://run.linkerd.io/install-edge | sh
@@ -136,7 +136,7 @@ jobs:
           tag=$(linkerd version --client --short)
           echo "linkerd $tag"
           echo "LINKERD_TAG=$tag" >> "$GITHUB_ENV"
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: just docker
       - run: just k3d-create
       - run: just k3d-load-linkerd
@@ -149,7 +149,7 @@ jobs:
     timeout-minutes: 3
     needs: [meta, actions, rust, rust-crates, linkerd-install]
     if: always()
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
 
     permissions:
       contents: write
@@ -168,7 +168,7 @@ jobs:
         if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
         run: exit 1
 
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
         if: needs.meta.outputs.is_dependabot == 'true' && needs.meta.outputs.any_changed == 'true'
       - name: "Merge dependabot changes"
         if: needs.meta.outputs.is_dependabot == 'true' && needs.meta.outputs.any_changed == 'true'

.github/workflows/release-weekly.yml

@@ -13,7 +13,7 @@ concurrency:
 jobs:
   last-release:
     if: github.repository == 'linkerd/linkerd2-proxy' # Don't run this in forks.
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     timeout-minutes: 5
     env:
       GH_REPO: ${{ github.repository }}
@@ -41,10 +41,10 @@ jobs:
 
   last-commit:
     needs: last-release
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - name: Check if the most recent commit is after the last release
         id: recency
         env:
@@ -62,7 +62,7 @@ jobs:
   trigger-release:
     needs: [last-release, last-commit]
     if: needs.last-release.outputs.recent == 'false' && needs.last-commit.outputs.after-release == 'true'
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     timeout-minutes: 5
     permissions:
       actions: write

.github/workflows/release.yml

@@ -46,6 +46,7 @@ on:
         default: true
 
 env:
+  CARGO: "cargo auditable"
   CARGO_INCREMENTAL: 0
   CARGO_NET_RETRY: 10
   RUSTFLAGS: "-D warnings -A deprecated --cfg tokio_unstable"
@@ -58,9 +59,25 @@ concurrency:
 jobs:
   meta:
     timeout-minutes: 5
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - id: meta
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        if: github.event_name == 'pull_request'
+      - id: workflow
+        if: github.event_name == 'pull_request'
+        uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c
+        with:
+          files: |
+            .github/workflows/release.yml
+      - id: build
+        if: github.event_name == 'pull_request'
+        uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c
+        with:
+          files: |
+            justfile
+            Cargo.toml
+
+      - id: version
         env:
           VERSION: ${{ inputs.version }}
         shell: bash
@@ -68,47 +85,45 @@ jobs:
           set -euo pipefail
           shopt -s extglob
           if [[ "$GITHUB_EVENT_NAME" == pull_request ]]; then
-            echo version="0.0.0-test.${GITHUB_SHA:0:7}"
-            echo archs='["amd64"]'
-            echo oses='["linux"]'
+            echo version="0.0.0-test.${GITHUB_SHA:0:7}" >> "$GITHUB_OUTPUT"
             exit 0
-          fi >> "$GITHUB_OUTPUT"
+          fi
           if ! [[ "$VERSION" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z-]+)?(\+[0-9A-Za-z-]+)?$ ]]; then
             echo "Invalid version: $VERSION" >&2
             exit 1
           fi
-          ( echo version="${VERSION#v}"
-            echo archs='["amd64", "arm64", "arm"]'
+          echo version="${VERSION#v}" >> "$GITHUB_OUTPUT"
+
+      - id: platform
+        shell: bash
+        env:
+          WORKFLOW_CHANGED: ${{ steps.workflow.outputs.any_changed }}
+        run: |
+          if [[ "$GITHUB_EVENT_NAME" == pull_request && "$WORKFLOW_CHANGED" != 'true' ]]; then
+            ( echo archs='["amd64"]'
+              echo oses='["linux"]' ) >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+          ( echo archs='["amd64", "arm64"]'
             echo oses='["linux", "windows"]'
           ) >> "$GITHUB_OUTPUT"
 
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-        if: github.event_name == 'pull_request'
-      - id: changed
-        if: github.event_name == 'pull_request'
-        uses: tj-actions/changed-files@ed68ef82c095e0d48ec87eccea555d944a631a4c
-        with:
-          files: |
-            .github/workflows/release.yml
-            justfile
-            Cargo.toml
-
     outputs:
-      archs: ${{ steps.meta.outputs.archs }}
-      oses: ${{ steps.meta.outputs.oses }}
-      version: ${{ steps.meta.outputs.version }}
-      package: ${{ github.event_name == 'workflow_dispatch' || steps.changed.outputs.any_changed == 'true' }}
+      archs: ${{ steps.platform.outputs.archs }}
+      oses: ${{ steps.platform.outputs.oses }}
+      version: ${{ steps.version.outputs.version }}
+      package: ${{ github.event_name == 'workflow_dispatch' || steps.build.outputs.any_changed == 'true' || steps.workflow.outputs.any_changed == 'true' }}
       profile: ${{ inputs.profile || 'release' }}
       publish: ${{ inputs.publish }}
       ref: ${{ inputs.ref || github.sha }}
-      tag: "${{ inputs.tag-prefix || 'release/' }}v${{ steps.meta.outputs.version }}"
+      tag: "${{ inputs.tag-prefix || 'release/' }}v${{ steps.version.outputs.version }}"
       prerelease: ${{ inputs.prerelease }}
       draft: ${{ inputs.draft }}
       latest: ${{ inputs.latest }}
 
   info:
     needs: meta
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     timeout-minutes: 3
     steps:
       - name: Inputs
@@ -134,15 +149,13 @@ jobs:
         exclude:
           - os: windows
             arch: arm64
-          - os: windows
-            arch: arm  
 
     # If we're not actually building on a release tag, don't short-circuit on
     # errors. This helps us know whether a failure is platform-specific.
     continue-on-error: ${{ needs.meta.outputs.publish != 'true' }}
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     timeout-minutes: 40
-    container: docker://ghcr.io/linkerd/dev:v45-rust-musl
+    container: docker://ghcr.io/linkerd/dev:v47-rust-musl
     env:
       LINKERD2_PROXY_VENDOR: ${{ github.repository_owner }}
       LINKERD2_PROXY_VERSION: ${{ needs.meta.outputs.version }}
@@ -150,15 +163,19 @@ jobs:
       # TODO: add to dev image
       - name: Install MiniGW
         if: matrix.os == 'windows'
-        run: apt-get update && apt-get install mingw-w64 -y
+        run: apt-get update && apt-get install -y mingw-w64
+      - name: Install cross compilation toolchain
+        if: matrix.arch == 'arm64'
+        run: apt-get update && apt-get install -y binutils-aarch64-linux-gnu
+
       - name: Configure git
         run: git config --global --add safe.directory "$PWD" # actions/runner#2033
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
         with:
           ref: ${{ needs.meta.outputs.ref }}
-      - uses: Swatinem/rust-cache@9d47c6ad4b02e050fd481d890b2ea34778fd09d6
+      - uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0
         with:
-          key: ${{ matrix.arch }}
+          key: ${{ matrix.os }}-${{ matrix.arch }}
       - run: just fetch
       - run: just arch=${{ matrix.arch }} libc=${{ matrix.libc }} os=${{ matrix.os }} rustup
       - run: just arch=${{ matrix.arch }} libc=${{ matrix.libc }} os=${{ matrix.os }} profile=${{ needs.meta.outputs.profile }} build
@@ -170,7 +187,7 @@ jobs:
 
   publish:
     needs: [meta, package]
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     timeout-minutes: 5
     permissions:
       actions: write
@@ -187,13 +204,13 @@ jobs:
           git config --global user.name "$GITHUB_USERNAME"
           git config --global user.email "$GITHUB_USERNAME"@users.noreply.github.com
       # Tag the release.
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
         with:
           token: ${{ secrets.LINKERD2_PROXY_GITHUB_TOKEN || github.token }}
           ref: ${{ needs.meta.outputs.ref }}
       - run: git tag -a -m "$VERSION" "$TAG"
       # Fetch the artifacts.
-      - uses: actions/download-artifact@95815c38cf2ff2164869cbab79da8d1f422bc89e
+      - uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093
         with:
           path: artifacts
       - run: du -h artifacts/**/*
@@ -201,7 +218,7 @@ jobs:
       - if: needs.meta.outputs.publish == 'true'
         run: git push origin "$TAG"
       - if: needs.meta.outputs.publish == 'true'
-        uses: softprops/action-gh-release@c95fe1489396fe8a9eb87c0abf8aa5b2ef267fda
+        uses: softprops/action-gh-release@72f2c25fcb47643c292f7107632f7a47c1df5cd8
         with:
           name: ${{ env.VERSION }}
           tag_name: ${{ env.TAG }}
@@ -225,7 +242,7 @@ jobs:
     needs: publish
     if: always()
     timeout-minutes: 3
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
       - name: Results
         run: |

.github/workflows/shellcheck.yml

@@ -13,8 +13,8 @@ on:
 jobs:
   sh-lint:
     timeout-minutes: 5
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - uses: linkerd/dev/actions/setup-tools@v45
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: linkerd/dev/actions/setup-tools@v47
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: just sh-lint

.github/workflows/toolchain.yml

@@ -13,10 +13,10 @@ permissions:
 
 jobs:
   devcontainer:
-    runs-on: ubuntu-24.04
-    container: ghcr.io/linkerd/dev:v45-rust
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
+    container: ghcr.io/linkerd/dev:v47-rust
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - run: git config --global --add safe.directory "$PWD" # actions/runner#2033
       - run: |
           VERSION_REGEX='channel = "([0-9]+\.[0-9]+\.[0-9]+)"'
@@ -35,10 +35,10 @@ jobs:
 
 
   workflows:
-    runs-on: ubuntu-24.04
+    runs-on: ${{ vars.LINKERD2_PROXY_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - uses: linkerd/dev/actions/setup-tools@v45
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: linkerd/dev/actions/setup-tools@v47
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - shell: bash
         run: |
           VERSION_REGEX='channel = "([0-9]+\.[0-9]+\.[0-9]+)"'

Cargo.toml

@@ -42,8 +42,6 @@ members = [
     "linkerd/idle-cache",
     "linkerd/io",
     "linkerd/meshtls",
-    "linkerd/meshtls/boring",
-    "linkerd/meshtls/rustls",
     "linkerd/meshtls/verifier",
     "linkerd/metrics",
     "linkerd/mock/http-body",
@@ -71,6 +69,7 @@ members = [
     "linkerd/reconnect",
     "linkerd/retry",
     "linkerd/router",
+    "linkerd/rustls",
     "linkerd/service-profiles",
     "linkerd/signal",
     "linkerd/stack",
@@ -115,14 +114,14 @@ prost = { version = "0.13" }
 prost-build = { version = "0.13", default-features = false }
 prost-types = { version = "0.13" }
 tokio-rustls = { version = "0.26", default-features = false, features = [
-    "ring",
     "logging",
 ] }
-tonic = { version = "0.12", default-features = false }
-tonic-build = { version = "0.12", default-features = false }
+tonic = { version = "0.13", default-features = false }
+tonic-build = { version = "0.13", default-features = false }
 tower = { version = "0.5", default-features = false }
 tower-service = { version = "0.3" }
 tower-test = { version = "0.4" }
+tracing = { version = "0.1" }
 
 [workspace.dependencies.http-body-util]
 version = "0.1.3"
@@ -135,4 +134,4 @@ default-features = false
 features = ["tokio", "tracing"]
 
 [workspace.dependencies.linkerd2-proxy-api]
-version = "0.16.0"
+version = "0.17.0"

Dockerfile

@@ -3,7 +3,7 @@
 # This is intended **DEVELOPMENT ONLY**, i.e. so that proxy developers can
 # easily test the proxy in the context of the larger `linkerd2` project.
 
-ARG RUST_IMAGE=ghcr.io/linkerd/dev:v45-rust
+ARG RUST_IMAGE=ghcr.io/linkerd/dev:v47-rust
 
 # Use an arbitrary ~recent edge release image to get the proxy
 # identity-initializing and linkerd-await wrappers.
@@ -14,11 +14,16 @@ FROM $LINKERD2_IMAGE as linkerd2
 FROM --platform=$BUILDPLATFORM $RUST_IMAGE as fetch
 
 ARG PROXY_FEATURES=""
+ARG TARGETARCH="amd64"
 RUN apt-get update && \
     apt-get install -y time && \
     if [[ "$PROXY_FEATURES" =~ .*meshtls-boring.* ]] ; then \
       apt-get install -y golang ; \
     fi && \
+    case "$TARGETARCH" in \
+        amd64) true ;; \
+        arm64) apt-get install --no-install-recommends -y binutils-aarch64-linux-gnu ;; \
+    esac && \
     rm -rf /var/lib/apt/lists/*
 
 ENV CARGO_NET_RETRY=10
@@ -33,7 +38,6 @@ RUN --mount=type=cache,id=cargo,target=/usr/local/cargo/registry \
 FROM fetch as build
 ENV CARGO_INCREMENTAL=0
 ENV RUSTFLAGS="-D warnings -A deprecated --cfg tokio_unstable"
-ARG TARGETARCH="amd64"
 ARG PROFILE="release"
 ARG LINKERD2_PROXY_VERSION=""
 ARG LINKERD2_PROXY_VENDOR=""

README.md

@@ -86,8 +86,9 @@ minutes to review our [code of conduct][coc].
 We test our code by way of fuzzing and this is described in [FUZZING.md](/docs/FUZZING.md).
 
 A third party security audit focused on fuzzing Linkerd2-proxy was performed by
-Ada Logics in 2021. The full report is available
-[here](/docs/reports/linkerd2-proxy-fuzzing-report.pdf).
+Ada Logics in 2021. The
+[full report](/docs/reports/linkerd2-proxy-fuzzing-report.pdf) can be found in
+the `docs/reports/` directory.
 
 ## License
 

deny.toml

@@ -2,7 +2,6 @@
 targets = [
     { triple = "x86_64-unknown-linux-gnu" },
     { triple = "aarch64-unknown-linux-gnu" },
-    { triple = "armv7-unknown-linux-gnu" },
 ]
 
 [advisories]
@@ -26,17 +25,12 @@ confidence-threshold = 0.8
 exceptions = [
     { allow = [
         "ISC",
-        "MIT",
         "OpenSSL",
-    ], name = "ring", version = "*" },
-]
-
-[[licenses.clarify]]
-name = "ring"
-version = "*"
-expression = "MIT AND ISC AND OpenSSL"
-license-files = [
-    { path = "LICENSE", hash = 0xbd0eed23 },
+    ], name = "aws-lc-sys", version = "*" },
+    { allow = [
+        "ISC",
+        "OpenSSL",
+    ], name = "aws-lc-fips-sys", version = "*" },
 ]
 
 [bans]
@@ -48,6 +42,8 @@ deny = [
     { name = "rustls", wrappers = ["tokio-rustls"] },
     # rustls-webpki should be used instead.
     { name = "webpki" },
+    # aws-lc-rs should be used instead.
+    { name = "ring" }
 ]
 skip = [
     # `linkerd-trace-context`, `rustls-pemfile` and `tonic` depend on `base64`
@@ -66,6 +62,10 @@ skip-tree = [
     { name = "rustix", version = "0.38" },
     # `pprof` uses a number of old dependencies. for now, we skip its subtree.
     { name = "pprof" },
+    # aws-lc-rs uses a slightly outdated version of bindgen
+    { name = "bindgen", version = "0.69.5" },
+    # socket v0.6 is still propagating through the ecosystem
+    { name = "socket2", version = "0.5" },
 ]
 
 [sources]

docs/FUZZING.md

@@ -12,9 +12,12 @@ engine.
 We place the fuzz tests into folders within the individual crates that the fuzz
 tests target. For example, we have a fuzz test that that target the crate
 `/linkerd/addr` and the code in `/linkerd/addr/src` and thus the fuzz test that
-targets this crate is put in `/linkerd/addr/fuzz`. The folder set up we use for
-each of the fuzz tests is automatically generated by `cargo fuzz init`
-(described [here](https://github.com/rust-fuzz/cargo-fuzz#cargo-fuzz-init)).
+targets this crate is put in `/linkerd/addr/fuzz`.
+
+The folder structure for each of the fuzz tests is automatically generated by
+`cargo fuzz init`. See cargo fuzz's
+[`README.md`](https://github.com/rust-fuzz/cargo-fuzz#cargo-fuzz-init) for more
+information.
 
 ### Fuzz targets
 
@@ -96,6 +99,5 @@ unit-test-like fuzzers, but are essentially just more substantial in nature. The
 idea behind these fuzzers is to test end-to-end concepts more so than individual
 components of the proxy.
 
-The inbound fuzzer
-[here](/linkerd/app/inbound/fuzz/fuzz_targets/fuzz_target_1.rs) is an example of
-this.
+The [inbound fuzzer](/linkerd/app/inbound/fuzz/fuzz_targets/fuzz_target_1.rs)
+is an example of this.

justfile

@@ -18,6 +18,10 @@ features := ""
 export LINKERD2_PROXY_VERSION := env_var_or_default("LINKERD2_PROXY_VERSION", "0.0.0-dev" + `git rev-parse --short HEAD`)
 export LINKERD2_PROXY_VENDOR := env_var_or_default("LINKERD2_PROXY_VENDOR", `whoami` + "@" + `hostname`)
 
+# TODO: these variables will be included in dev v48
+export AWS_LC_SYS_CFLAGS_aarch64_unknown_linux_gnu := env_var_or_default("AWS_LC_SYS_CFLAGS_aarch64_unknown_linux_gnu", "-fuse-ld=/usr/aarch64-linux-gnu/bin/ld")
+export AWS_LC_SYS_CFLAGS_aarch64_unknown_linux_musl := env_var_or_default("AWS_LC_SYS_CFLAGS_aarch64_unknown_linux_musl", "-fuse-ld=/usr/aarch64-linux-gnu/bin/ld")
+
 # The version name to use for packages.
 package_version := "v" + LINKERD2_PROXY_VERSION
 
@@ -26,7 +30,7 @@ docker-repo := "localhost/linkerd/proxy"
 docker-tag := `git rev-parse --abbrev-ref HEAD | sed 's|/|.|g'` + "." + `git rev-parse --short HEAD`
 docker-image := docker-repo + ":" + docker-tag
 
-# The architecture name to use for packages. Either 'amd64', 'arm64', or 'arm'.
+# The architecture name to use for packages. Either 'amd64' or 'arm64'.
 arch := "amd64"
 # The OS name to use for packages. Either 'linux' or 'windows'.
 os := "linux"
@@ -39,8 +43,6 @@ _target := if os + '-' + arch == "linux-amd64" {
         "x86_64-unknown-linux-" + libc
     } else if os + '-' + arch == "linux-arm64" {
         "aarch64-unknown-linux-" + libc
-    } else if os + '-' + arch == "linux-arm" {
-        "armv7-unknown-linux-" + libc + "eabihf"
     } else if os + '-' + arch == "windows-amd64" {
         "x86_64-pc-windows-" + libc
     } else {
@@ -139,7 +141,7 @@ _strip:
 
 _package_bin := _package_dir / "bin" / "linkerd2-proxy"
 
-# XXX {aarch64,arm}-musl builds do not enable PIE, so we use target-specific
+# XXX aarch64-musl builds do not enable PIE, so we use target-specific
 # files to document those differences.
 _expected_checksec := '.checksec' / arch + '-' + libc + '.json'
 

linkerd/addr/fuzz/Cargo.toml

@@ -13,7 +13,7 @@ cargo-fuzz = true
 libfuzzer-sys = "0.4"
 linkerd-addr = { path = ".." }
 linkerd-tracing = { path = "../../tracing", features = ["ansi"] }
-tracing = "0.1"
+tracing = { workspace = true }
 
 # Prevent this from interfering with workspaces
 [workspace]

linkerd/addr/src/lib.rs

@@ -100,15 +100,11 @@ impl Addr {
                     // them ourselves.
                     format!("[{}]", a.ip())
                 };
-                http::uri::Authority::from_str(&ip).unwrap_or_else(|err| {
-                    panic!("SocketAddr ({}) must be valid authority: {}", a, err)
-                })
-            }
-            Addr::Socket(a) => {
-                http::uri::Authority::from_str(&a.to_string()).unwrap_or_else(|err| {
-                    panic!("SocketAddr ({}) must be valid authority: {}", a, err)
-                })
+                http::uri::Authority::from_str(&ip)
+                    .unwrap_or_else(|err| panic!("SocketAddr ({a}) must be valid authority: {err}"))
             }
+            Addr::Socket(a) => http::uri::Authority::from_str(&a.to_string())
+                .unwrap_or_else(|err| panic!("SocketAddr ({a}) must be valid authority: {err}")),
         }
     }
 
@@ -265,14 +261,14 @@ mod tests {
         ];
         for (host, expected_result) in cases {
             let a = Addr::from_str(host).unwrap();
-            assert_eq!(a.is_loopback(), *expected_result, "{:?}", host)
+            assert_eq!(a.is_loopback(), *expected_result, "{host:?}")
         }
     }
 
     fn test_to_http_authority(cases: &[&str]) {
         let width = cases.iter().map(|s| s.len()).max().unwrap_or(0);
         for host in cases {
-            print!("trying {:1$} ... ", host, width);
+            print!("trying {host:width$} ... ");
             Addr::from_str(host).unwrap().to_http_authority();
             println!("ok");
         }

linkerd/app/Cargo.toml

@@ -36,4 +36,4 @@ tokio = { version = "1", features = ["rt"] }
 tokio-stream = { version = "0.1", features = ["time", "sync"] }
 tonic = { workspace = true, default-features = false, features = ["prost"] }
 tower = { workspace = true }
-tracing = "0.1"
+tracing = { workspace = true }

linkerd/app/admin/Cargo.toml

@@ -22,12 +22,12 @@ http-body = { workspace = true }
 http-body-util = { workspace = true }
 hyper = { workspace = true, features = ["http1", "http2"] }
 futures = { version = "0.3", default-features = false }
-pprof = { version = "0.14", optional = true, features = ["prost-codec"] }
+pprof = { version = "0.15", optional = true, features = ["prost-codec"] }
 serde = "1"
 serde_json = "1"
 thiserror = "2"
 tokio = { version = "1", features = ["macros", "sync", "parking_lot"] }
-tracing = "0.1"
+tracing = { workspace = true }
 
 linkerd-app-core = { path = "../core" }
 linkerd-app-inbound = { path = "../inbound" }

linkerd/app/admin/src/server.rs

@@ -13,7 +13,7 @@
 use futures::future::{self, TryFutureExt};
 use http::StatusCode;
 use linkerd_app_core::{
-    metrics::{self as metrics, FmtMetrics},
+    metrics::{self as metrics, legacy::FmtMetrics},
     proxy::http::{Body, BoxBody, ClientHandle, Request, Response},
     trace, Error, Result,
 };
@@ -32,7 +32,7 @@ pub use self::readiness::{Latch, Readiness};
 
 #[derive(Clone)]
 pub struct Admin<M> {
-    metrics: metrics::Serve<M>,
+    metrics: metrics::legacy::Serve<M>,
     tracing: trace::Handle,
     ready: Readiness,
     shutdown_tx: mpsc::UnboundedSender<()>,
@@ -52,7 +52,7 @@ impl<M> Admin<M> {
         tracing: trace::Handle,
     ) -> Self {
         Self {
-            metrics: metrics::Serve::new(metrics),
+            metrics: metrics::legacy::Serve::new(metrics),
             ready,
             shutdown_tx,
             enable_shutdown,

linkerd/app/admin/src/server/log/level.rs

@@ -27,7 +27,7 @@ where
                 .into_body()
                 .collect()
                 .await
-                .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?
+                .map_err(io::Error::other)?
                 .aggregate();
             match level.set_from(body.chunk()) {
                 Ok(_) => mk_rsp(StatusCode::NO_CONTENT, BoxBody::empty()),

linkerd/app/admin/src/stack.rs

@@ -2,7 +2,7 @@ use linkerd_app_core::{
     classify,
     config::ServerConfig,
     drain, errors, identity,
-    metrics::{self, FmtMetrics},
+    metrics::{self, legacy::FmtMetrics},
     proxy::http,
     serve,
     svc::{self, ExtractParam, InsertParam, Param},
@@ -214,7 +214,7 @@ impl Config {
 impl Param<transport::labels::Key> for Tcp {
     fn param(&self) -> transport::labels::Key {
         transport::labels::Key::inbound_server(
-            self.tls.clone(),
+            self.tls.as_ref().map(|t| t.labels()),
             self.addr.into(),
             self.policy.server_label(),
         )
@@ -272,7 +272,7 @@ impl Param<metrics::ServerLabel> for Http {
 impl Param<metrics::EndpointLabels> for Permitted {
     fn param(&self) -> metrics::EndpointLabels {
         metrics::InboundEndpointLabels {
-            tls: self.http.tcp.tls.clone(),
+            tls: self.http.tcp.tls.as_ref().map(|t| t.labels()),
             authority: None,
             target_addr: self.http.tcp.addr.into(),
             policy: self.permit.labels.clone(),

linkerd/app/core/Cargo.toml

@@ -13,31 +13,23 @@ independently of the inbound and outbound proxy logic.
 """
 
 [dependencies]
-bytes = { workspace = true }
 drain = { workspace = true, features = ["retain"] }
 http = { workspace = true }
 http-body = { workspace = true }
-http-body-util = { workspace = true }
 hyper = { workspace = true, features = ["http1", "http2"] }
-hyper-util = { workspace = true }
 futures = { version = "0.3", default-features = false }
 ipnet = "2.11"
 prometheus-client = { workspace = true }
-regex = "1"
-serde_json = "1"
 thiserror = "2"
 tokio = { version = "1", features = ["macros", "sync", "parking_lot"] }
 tokio-stream = { version = "0.1", features = ["time"] }
 tonic = { workspace = true, default-features = false, features = ["prost"] }
-tracing = "0.1"
-parking_lot = "0.12"
+tracing = { workspace = true }
 pin-project = "1"
 
 linkerd-addr = { path = "../../addr" }
 linkerd-conditional = { path = "../../conditional" }
 linkerd-dns = { path = "../../dns" }
-linkerd-duplex = { path = "../../duplex" }
-linkerd-errno = { path = "../../errno" }
 linkerd-error = { path = "../../error" }
 linkerd-error-respond = { path = "../../error-respond" }
 linkerd-exp-backoff = { path = "../../exp-backoff" }
@@ -64,6 +56,7 @@ linkerd-proxy-tcp = { path = "../../proxy/tcp" }
 linkerd-proxy-transport = { path = "../../proxy/transport" }
 linkerd-reconnect = { path = "../../reconnect" }
 linkerd-router = { path = "../../router" }
+linkerd-rustls = { path = "../../rustls" }
 linkerd-service-profiles = { path = "../../service-profiles" }
 linkerd-stack = { path = "../../stack" }
 linkerd-stack-metrics = { path = "../../stack/metrics" }
@@ -83,5 +76,6 @@ features = ["make", "spawn-ready", "timeout", "util", "limit"]
 semver = "1"
 
 [dev-dependencies]
+bytes = { workspace = true }
+http-body-util = { workspace = true }
 linkerd-mock-http-body = { path = "../../mock/http-body" }
-quickcheck = { version = "1", default-features = false }

linkerd/app/core/build.rs

@@ -4,11 +4,11 @@ fn set_env(name: &str, cmd: &mut Command) {
     let value = match cmd.output() {
         Ok(output) => String::from_utf8(output.stdout).unwrap(),
         Err(err) => {
-            println!("cargo:warning={}", err);
+            println!("cargo:warning={err}");
             "".to_string()
         }
     };
-    println!("cargo:rustc-env={}={}", name, value);
+    println!("cargo:rustc-env={name}={value}");
 }
 
 fn version() -> String {

linkerd/app/core/src/classify.rs

@@ -1,5 +1,4 @@
 use crate::profiles;
-pub use classify::gate;
 use linkerd_error::Error;
 use linkerd_proxy_client_policy as client_policy;
 use linkerd_proxy_http::{classify, HasH2Reason, ResponseTimeoutError};
@@ -214,7 +213,7 @@ fn h2_error(err: &Error) -> String {
     if let Some(reason) = err.h2_reason() {
         // This should output the error code in the same format as the spec,
         // for example: PROTOCOL_ERROR
-        format!("h2({:?})", reason)
+        format!("h2({reason:?})")
     } else {
         trace!("classifying found non-h2 error: {:?}", err);
         String::from("unclassified")

linkerd/app/core/src/control.rs

@@ -101,7 +101,7 @@ impl Config {
         identity: identity::NewClient,
     ) -> svc::ArcNewService<
         (),
-        svc::BoxCloneSyncService<http::Request<tonic::body::BoxBody>, http::Response<RspBody>>,
+        svc::BoxCloneSyncService<http::Request<tonic::body::Body>, http::Response<RspBody>>,
     > {
         let addr = self.addr;
         tracing::trace!(%addr, "Building");

linkerd/app/core/src/lib.rs

@@ -25,6 +25,7 @@ pub mod metrics;
 pub mod proxy;
 pub mod serve;
 pub mod svc;
+pub mod tls_info;
 pub mod transport;
 
 pub use self::build_info::{BuildInfo, BUILD_INFO};

linkerd/app/core/src/metrics.rs

@@ -54,7 +54,7 @@ pub struct Proxy {
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct ControlLabels {
     addr: Addr,
-    server_id: tls::ConditionalClientTls,
+    server_id: tls::ConditionalClientTlsLabels,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
@@ -65,7 +65,7 @@ pub enum EndpointLabels {
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct InboundEndpointLabels {
-    pub tls: tls::ConditionalServerTls,
+    pub tls: tls::ConditionalServerTlsLabels,
     pub authority: Option<http::uri::Authority>,
     pub target_addr: SocketAddr,
     pub policy: RouteAuthzLabels,
@@ -98,7 +98,7 @@ pub struct RouteAuthzLabels {
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub struct OutboundEndpointLabels {
-    pub server_id: tls::ConditionalClientTls,
+    pub server_id: tls::ConditionalClientTlsLabels,
     pub authority: Option<http::uri::Authority>,
     pub labels: Option<String>,
     pub zone_locality: OutboundZoneLocality,
@@ -155,10 +155,10 @@ where
     I: Iterator<Item = (&'i String, &'i String)>,
 {
     let (k0, v0) = labels_iter.next()?;
-    let mut out = format!("{}_{}=\"{}\"", prefix, k0, v0);
+    let mut out = format!("{prefix}_{k0}=\"{v0}\"");
 
     for (k, v) in labels_iter {
-        write!(out, ",{}_{}=\"{}\"", prefix, k, v).expect("label concat must succeed");
+        write!(out, ",{prefix}_{k}=\"{v}\"").expect("label concat must succeed");
     }
     Some(out)
 }
@@ -166,7 +166,7 @@ where
 // === impl Metrics ===
 
 impl Metrics {
-    pub fn new(retain_idle: Duration) -> (Self, impl FmtMetrics + Clone + Send + 'static) {
+    pub fn new(retain_idle: Duration) -> (Self, impl legacy::FmtMetrics + Clone + Send + 'static) {
         let (control, control_report) = {
             let m = http_metrics::Requests::<ControlLabels, Class>::default();
             let r = m.clone().into_report(retain_idle).with_prefix("control");
@@ -223,6 +223,7 @@ impl Metrics {
             opentelemetry,
         };
 
+        use legacy::FmtMetrics as _;
         let report = endpoint_report
             .and_report(profile_route_report)
             .and_report(retry_report)
@@ -243,15 +244,17 @@ impl svc::Param<ControlLabels> for control::ControlAddr {
     fn param(&self) -> ControlLabels {
         ControlLabels {
             addr: self.addr.clone(),
-            server_id: self.identity.clone(),
+            server_id: self.identity.as_ref().map(tls::ClientTls::labels),
         }
     }
 }
 
-impl FmtLabels for ControlLabels {
+impl legacy::FmtLabels for ControlLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "addr=\"{}\",", self.addr)?;
-        TlsConnect::from(&self.server_id).fmt_labels(f)?;
+        let Self { addr, server_id } = self;
+
+        write!(f, "addr=\"{addr}\",")?;
+        TlsConnect::from(server_id).fmt_labels(f)?;
 
         Ok(())
     }
@@ -279,13 +282,19 @@ impl ProfileRouteLabels {
     }
 }
 
-impl FmtLabels for ProfileRouteLabels {
+impl legacy::FmtLabels for ProfileRouteLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.direction.fmt_labels(f)?;
-        write!(f, ",dst=\"{}\"", self.addr)?;
+        let Self {
+            direction,
+            addr,
+            labels,
+        } = self;
 
-        if let Some(labels) = self.labels.as_ref() {
-            write!(f, ",{}", labels)?;
+        direction.fmt_labels(f)?;
+        write!(f, ",dst=\"{addr}\"")?;
+
+        if let Some(labels) = labels.as_ref() {
+            write!(f, ",{labels}")?;
         }
 
         Ok(())
@@ -306,7 +315,7 @@ impl From<OutboundEndpointLabels> for EndpointLabels {
     }
 }
 
-impl FmtLabels for EndpointLabels {
+impl legacy::FmtLabels for EndpointLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::Inbound(i) => (Direction::In, i).fmt_labels(f),
@@ -315,32 +324,36 @@ impl FmtLabels for EndpointLabels {
     }
 }
 
-impl FmtLabels for InboundEndpointLabels {
+impl legacy::FmtLabels for InboundEndpointLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        if let Some(a) = self.authority.as_ref() {
+        let Self {
+            tls,
+            authority,
+            target_addr,
+            policy,
+        } = self;
+
+        if let Some(a) = authority.as_ref() {
             Authority(a).fmt_labels(f)?;
             write!(f, ",")?;
         }
 
-        (
-            (TargetAddr(self.target_addr), TlsAccept::from(&self.tls)),
-            &self.policy,
-        )
-            .fmt_labels(f)?;
+        ((TargetAddr(*target_addr), TlsAccept::from(tls)), policy).fmt_labels(f)?;
 
         Ok(())
     }
 }
 
-impl FmtLabels for ServerLabel {
+impl legacy::FmtLabels for ServerLabel {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let Self(meta, port) = self;
         write!(
             f,
             "srv_group=\"{}\",srv_kind=\"{}\",srv_name=\"{}\",srv_port=\"{}\"",
-            self.0.group(),
-            self.0.kind(),
-            self.0.name(),
-            self.1
+            meta.group(),
+            meta.kind(),
+            meta.name(),
+            port
         )
     }
 }
@@ -362,41 +375,47 @@ impl prom::EncodeLabelSetMut for ServerLabel {
     }
 }
 
-impl FmtLabels for ServerAuthzLabels {
+impl legacy::FmtLabels for ServerAuthzLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.server.fmt_labels(f)?;
+        let Self { server, authz } = self;
+
+        server.fmt_labels(f)?;
         write!(
             f,
             ",authz_group=\"{}\",authz_kind=\"{}\",authz_name=\"{}\"",
-            self.authz.group(),
-            self.authz.kind(),
-            self.authz.name()
+            authz.group(),
+            authz.kind(),
+            authz.name()
         )
     }
 }
 
-impl FmtLabels for RouteLabels {
+impl legacy::FmtLabels for RouteLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.server.fmt_labels(f)?;
+        let Self { server, route } = self;
+
+        server.fmt_labels(f)?;
         write!(
             f,
             ",route_group=\"{}\",route_kind=\"{}\",route_name=\"{}\"",
-            self.route.group(),
-            self.route.kind(),
-            self.route.name(),
+            route.group(),
+            route.kind(),
+            route.name(),
         )
     }
 }
 
-impl FmtLabels for RouteAuthzLabels {
+impl legacy::FmtLabels for RouteAuthzLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.route.fmt_labels(f)?;
+        let Self { route, authz } = self;
+
+        route.fmt_labels(f)?;
         write!(
             f,
             ",authz_group=\"{}\",authz_kind=\"{}\",authz_name=\"{}\"",
-            self.authz.group(),
-            self.authz.kind(),
-            self.authz.name(),
+            authz.group(),
+            authz.kind(),
+            authz.name(),
         )
     }
 }
@@ -407,19 +426,28 @@ impl svc::Param<OutboundZoneLocality> for OutboundEndpointLabels {
     }
 }
 
-impl FmtLabels for OutboundEndpointLabels {
+impl legacy::FmtLabels for OutboundEndpointLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        if let Some(a) = self.authority.as_ref() {
+        let Self {
+            server_id,
+            authority,
+            labels,
+            // TODO(kate): this label is not currently emitted.
+            zone_locality: _,
+            target_addr,
+        } = self;
+
+        if let Some(a) = authority.as_ref() {
             Authority(a).fmt_labels(f)?;
             write!(f, ",")?;
         }
 
-        let ta = TargetAddr(self.target_addr);
-        let tls = TlsConnect::from(&self.server_id);
+        let ta = TargetAddr(*target_addr);
+        let tls = TlsConnect::from(server_id);
         (ta, tls).fmt_labels(f)?;
 
-        if let Some(labels) = self.labels.as_ref() {
-            write!(f, ",{}", labels)?;
+        if let Some(labels) = labels.as_ref() {
+            write!(f, ",{labels}")?;
         }
 
         Ok(())
@@ -435,19 +463,20 @@ impl fmt::Display for Direction {
     }
 }
 
-impl FmtLabels for Direction {
+impl legacy::FmtLabels for Direction {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "direction=\"{}\"", self)
+        write!(f, "direction=\"{self}\"")
     }
 }
 
-impl FmtLabels for Authority<'_> {
+impl legacy::FmtLabels for Authority<'_> {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "authority=\"{}\"", self.0)
+        let Self(authority) = self;
+        write!(f, "authority=\"{authority}\"")
     }
 }
 
-impl FmtLabels for Class {
+impl legacy::FmtLabels for Class {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let class = |ok: bool| if ok { "success" } else { "failure" };
 
@@ -469,8 +498,7 @@ impl FmtLabels for Class {
 
             Class::Error(msg) => write!(
                 f,
-                "classification=\"failure\",grpc_status=\"\",error=\"{}\"",
-                msg
+                "classification=\"failure\",grpc_status=\"\",error=\"{msg}\""
             ),
         }
     }
@@ -496,9 +524,15 @@ impl StackLabels {
     }
 }
 
-impl FmtLabels for StackLabels {
+impl legacy::FmtLabels for StackLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.direction.fmt_labels(f)?;
-        write!(f, ",protocol=\"{}\",name=\"{}\"", self.protocol, self.name)
+        let Self {
+            direction,
+            protocol,
+            name,
+        } = self;
+
+        direction.fmt_labels(f)?;
+        write!(f, ",protocol=\"{protocol}\",name=\"{name}\"")
     }
 }

linkerd/app/core/src/tls_info.rs

@@ -0,0 +1,70 @@
+use linkerd_metrics::prom;
+use prometheus_client::encoding::{EncodeLabelSet, EncodeLabelValue, LabelValueEncoder};
+use std::{
+    fmt::{Error, Write},
+    sync::{Arc, OnceLock},
+};
+
+static TLS_INFO: OnceLock<Arc<TlsInfo>> = OnceLock::new();
+
+#[derive(Clone, Debug, Default, Hash, PartialEq, Eq, EncodeLabelSet)]
+pub struct TlsInfo {
+    tls_suites: MetricValueList,
+    tls_kx_groups: MetricValueList,
+    tls_rand: String,
+    tls_key_provider: String,
+    tls_fips: bool,
+}
+
+#[derive(Clone, Debug, Default, Hash, PartialEq, Eq)]
+struct MetricValueList {
+    values: Vec<&'static str>,
+}
+
+impl FromIterator<&'static str> for MetricValueList {
+    fn from_iter<T: IntoIterator<Item = &'static str>>(iter: T) -> Self {
+        MetricValueList {
+            values: iter.into_iter().collect(),
+        }
+    }
+}
+
+impl EncodeLabelValue for MetricValueList {
+    fn encode(&self, encoder: &mut LabelValueEncoder<'_>) -> Result<(), Error> {
+        for value in &self.values {
+            value.encode(encoder)?;
+            encoder.write_char(',')?;
+        }
+        Ok(())
+    }
+}
+
+pub fn metric() -> prom::Family<TlsInfo, prom::ConstGauge> {
+    let fam = prom::Family::<TlsInfo, prom::ConstGauge>::new_with_constructor(|| {
+        prom::ConstGauge::new(1)
+    });
+
+    let tls_info = TLS_INFO.get_or_init(|| {
+        let provider = linkerd_rustls::get_default_provider();
+
+        let tls_suites = provider
+            .cipher_suites
+            .iter()
+            .flat_map(|cipher_suite| cipher_suite.suite().as_str())
+            .collect::<MetricValueList>();
+        let tls_kx_groups = provider
+            .kx_groups
+            .iter()
+            .flat_map(|suite| suite.name().as_str())
+            .collect::<MetricValueList>();
+        Arc::new(TlsInfo {
+            tls_suites,
+            tls_kx_groups,
+            tls_rand: format!("{:?}", provider.secure_random),
+            tls_key_provider: format!("{:?}", provider.key_provider),
+            tls_fips: provider.fips(),
+        })
+    });
+    let _ = fam.get_or_create(tls_info);
+    fam
+}

linkerd/app/core/src/transport/labels.rs

@@ -1,7 +1,7 @@
 use crate::metrics::ServerLabel as PolicyServerLabel;
 pub use crate::metrics::{Direction, OutboundEndpointLabels};
 use linkerd_conditional::Conditional;
-use linkerd_metrics::FmtLabels;
+use linkerd_metrics::legacy::FmtLabels;
 use linkerd_tls as tls;
 use std::{fmt, net::SocketAddr};
 
@@ -20,16 +20,16 @@ pub enum Key {
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
 pub struct ServerLabels {
     direction: Direction,
-    tls: tls::ConditionalServerTls,
+    tls: tls::ConditionalServerTlsLabels,
     target_addr: SocketAddr,
     policy: Option<PolicyServerLabel>,
 }
 
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
-pub struct TlsAccept<'t>(pub &'t tls::ConditionalServerTls);
+pub struct TlsAccept<'t>(pub &'t tls::ConditionalServerTlsLabels);
 
 #[derive(Clone, Debug, Eq, PartialEq, Hash)]
-pub(crate) struct TlsConnect<'t>(&'t tls::ConditionalClientTls);
+pub(crate) struct TlsConnect<'t>(pub &'t tls::ConditionalClientTlsLabels);
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
 pub struct TargetAddr(pub SocketAddr);
@@ -38,7 +38,7 @@ pub struct TargetAddr(pub SocketAddr);
 
 impl Key {
     pub fn inbound_server(
-        tls: tls::ConditionalServerTls,
+        tls: tls::ConditionalServerTlsLabels,
         target_addr: SocketAddr,
         server: PolicyServerLabel,
     ) -> Self {
@@ -62,7 +62,7 @@ impl FmtLabels for Key {
             }
 
             Self::InboundClient => {
-                const NO_TLS: tls::client::ConditionalClientTls =
+                const NO_TLS: tls::client::ConditionalClientTlsLabels =
                     Conditional::None(tls::NoClientTls::Loopback);
 
                 Direction::In.fmt_labels(f)?;
@@ -75,7 +75,7 @@ impl FmtLabels for Key {
 
 impl ServerLabels {
     fn inbound(
-        tls: tls::ConditionalServerTls,
+        tls: tls::ConditionalServerTlsLabels,
         target_addr: SocketAddr,
         policy: PolicyServerLabel,
     ) -> Self {
@@ -90,7 +90,7 @@ impl ServerLabels {
     fn outbound(target_addr: SocketAddr) -> Self {
         ServerLabels {
             direction: Direction::Out,
-            tls: tls::ConditionalServerTls::None(tls::NoServerTls::Loopback),
+            tls: tls::ConditionalServerTlsLabels::None(tls::NoServerTls::Loopback),
             target_addr,
             policy: None,
         }
@@ -99,14 +99,17 @@ impl ServerLabels {
 
 impl FmtLabels for ServerLabels {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        self.direction.fmt_labels(f)?;
+        let Self {
+            direction,
+            tls,
+            target_addr,
+            policy,
+        } = self;
+
+        direction.fmt_labels(f)?;
         f.write_str(",peer=\"src\",")?;
 
-        (
-            (TargetAddr(self.target_addr), TlsAccept(&self.tls)),
-            self.policy.as_ref(),
-        )
-            .fmt_labels(f)?;
+        ((TargetAddr(*target_addr), TlsAccept(tls)), policy.as_ref()).fmt_labels(f)?;
 
         Ok(())
     }
@@ -114,27 +117,28 @@ impl FmtLabels for ServerLabels {
 
 // === impl TlsAccept ===
 
-impl<'t> From<&'t tls::ConditionalServerTls> for TlsAccept<'t> {
-    fn from(c: &'t tls::ConditionalServerTls) -> Self {
+impl<'t> From<&'t tls::ConditionalServerTlsLabels> for TlsAccept<'t> {
+    fn from(c: &'t tls::ConditionalServerTlsLabels) -> Self {
         TlsAccept(c)
     }
 }
 
 impl FmtLabels for TlsAccept<'_> {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {
+        let Self(tls) = self;
+        match tls {
             Conditional::None(tls::NoServerTls::Disabled) => {
                 write!(f, "tls=\"disabled\"")
             }
             Conditional::None(why) => {
-                write!(f, "tls=\"no_identity\",no_tls_reason=\"{}\"", why)
+                write!(f, "tls=\"no_identity\",no_tls_reason=\"{why}\"")
             }
-            Conditional::Some(tls::ServerTls::Established { client_id, .. }) => match client_id {
-                Some(id) => write!(f, "tls=\"true\",client_id=\"{}\"", id),
+            Conditional::Some(tls::ServerTlsLabels::Established { client_id }) => match client_id {
+                Some(id) => write!(f, "tls=\"true\",client_id=\"{id}\""),
                 None => write!(f, "tls=\"true\",client_id=\"\""),
             },
-            Conditional::Some(tls::ServerTls::Passthru { sni }) => {
-                write!(f, "tls=\"opaque\",sni=\"{}\"", sni)
+            Conditional::Some(tls::ServerTlsLabels::Passthru { sni }) => {
+                write!(f, "tls=\"opaque\",sni=\"{sni}\"")
             }
         }
     }
@@ -142,23 +146,25 @@ impl FmtLabels for TlsAccept<'_> {
 
 // === impl TlsConnect ===
 
-impl<'t> From<&'t tls::ConditionalClientTls> for TlsConnect<'t> {
-    fn from(s: &'t tls::ConditionalClientTls) -> Self {
+impl<'t> From<&'t tls::ConditionalClientTlsLabels> for TlsConnect<'t> {
+    fn from(s: &'t tls::ConditionalClientTlsLabels) -> Self {
         TlsConnect(s)
     }
 }
 
 impl FmtLabels for TlsConnect<'_> {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.0 {
+        let Self(tls) = self;
+
+        match tls {
             Conditional::None(tls::NoClientTls::Disabled) => {
                 write!(f, "tls=\"disabled\"")
             }
             Conditional::None(why) => {
-                write!(f, "tls=\"no_identity\",no_tls_reason=\"{}\"", why)
+                write!(f, "tls=\"no_identity\",no_tls_reason=\"{why}\"")
             }
-            Conditional::Some(tls::ClientTls { server_id, .. }) => {
-                write!(f, "tls=\"true\",server_id=\"{}\"", server_id)
+            Conditional::Some(tls::ClientTlsLabels { server_id }) => {
+                write!(f, "tls=\"true\",server_id=\"{server_id}\"")
             }
         }
     }
@@ -168,12 +174,13 @@ impl FmtLabels for TlsConnect<'_> {
 
 impl FmtLabels for TargetAddr {
     fn fmt_labels(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let Self(target_addr) = self;
         write!(
             f,
             "target_addr=\"{}\",target_ip=\"{}\",target_port=\"{}\"",
-            self.0,
-            self.0.ip(),
-            self.0.port()
+            target_addr,
+            target_addr.ip(),
+            target_addr.port()
         )
     }
 }
@@ -194,9 +201,8 @@ mod tests {
         use std::sync::Arc;
 
         let labels = ServerLabels::inbound(
-            tls::ConditionalServerTls::Some(tls::ServerTls::Established {
+            tls::ConditionalServerTlsLabels::Some(tls::ServerTlsLabels::Established {
                 client_id: Some("foo.id.example.com".parse().unwrap()),
-                negotiated_protocol: None,
             }),
             ([192, 0, 2, 4], 40000).into(),
             PolicyServerLabel(

linkerd/app/gateway/Cargo.toml

@@ -18,7 +18,7 @@ thiserror = "2"
 tokio = { version = "1", features = ["sync"] }
 tonic = { workspace = true, default-features = false }
 tower = { workspace = true, default-features = false }
-tracing = "0.1"
+tracing = { workspace = true }
 
 [dev-dependencies]
 linkerd-app-inbound = { path = "../inbound", features = ["test-util"] }

linkerd/app/gateway/src/discover.rs

@@ -90,7 +90,7 @@ impl Gateway {
                                 detect_timeout,
                                 queue,
                                 addr,
-                                meta,
+                                meta.into(),
                             ),
                             None => {
                                 tracing::debug!(

linkerd/app/gateway/src/http.rs

@@ -153,7 +153,7 @@ fn mk_routes(profile: &profiles::Profile) -> Option<outbound::http::Routes> {
     if let Some((addr, metadata)) = profile.endpoint.clone() {
         return Some(outbound::http::Routes::Endpoint(
             Remote(ServerAddr(addr)),
-            metadata,
+            metadata.into(),
         ));
     }
 

linkerd/app/inbound/Cargo.toml

@@ -13,8 +13,7 @@ Configures and runs the inbound proxy
 test-util = [
     "linkerd-app-test",
     "linkerd-idle-cache/test-util",
-    "linkerd-meshtls/rustls",
-    "linkerd-meshtls-rustls/test-util",
+    "linkerd-meshtls/test-util",
 ]
 
 [dependencies]
@@ -25,8 +24,7 @@ linkerd-app-core = { path = "../core" }
 linkerd-app-test = { path = "../test", optional = true }
 linkerd-http-access-log = { path = "../../http/access-log" }
 linkerd-idle-cache = { path = "../../idle-cache" }
-linkerd-meshtls = { path = "../../meshtls", optional = true }
-linkerd-meshtls-rustls = { path = "../../meshtls/rustls", optional = true }
+linkerd-meshtls = { path = "../../meshtls", optional = true, default-features = false }
 linkerd-proxy-client-policy = { path = "../../proxy/client-policy" }
 linkerd-tonic-stream = { path = "../../tonic-stream" }
 linkerd-tonic-watch = { path = "../../tonic-watch" }
@@ -38,7 +36,7 @@ thiserror = "2"
 tokio = { version = "1", features = ["sync"] }
 tonic = { workspace = true, default-features = false }
 tower = { workspace = true, features = ["util"] }
-tracing = "0.1"
+tracing = { workspace = true }
 
 [dependencies.linkerd-proxy-server-policy]
 path = "../../proxy/server-policy"
@@ -49,7 +47,7 @@ hyper = { workspace = true, features = ["http1", "http2"] }
 linkerd-app-test = { path = "../test" }
 arbitrary = { version = "1", features = ["derive"] }
 libfuzzer-sys = { version = "0.4", features = ["arbitrary-derive"] }
-linkerd-meshtls-rustls = { path = "../../meshtls/rustls", features = [
+linkerd-meshtls = { path = "../../meshtls", features = [
     "test-util",
 ] }
 
@@ -62,8 +60,7 @@ linkerd-http-metrics = { path = "../../http/metrics", features = ["test-util"] }
 linkerd-http-box = { path = "../../http/box" }
 linkerd-idle-cache = { path = "../../idle-cache", features = ["test-util"] }
 linkerd-io = { path = "../../io", features = ["tokio-test"] }
-linkerd-meshtls = { path = "../../meshtls", features = ["rustls"] }
-linkerd-meshtls-rustls = { path = "../../meshtls/rustls", features = [
+linkerd-meshtls = { path = "../../meshtls", features = [
     "test-util",
 ] }
 linkerd-proxy-server-policy = { path = "../../proxy/server-policy", features = [

linkerd/app/inbound/fuzz/Cargo.toml

@@ -18,13 +18,12 @@ linkerd-app-core = { path = "../../core" }
 linkerd-app-inbound = { path = ".." }
 linkerd-app-test = { path = "../../test" }
 linkerd-idle-cache = { path = "../../../idle-cache", features = ["test-util"] }
-linkerd-meshtls = { path = "../../../meshtls", features = ["rustls"] }
-linkerd-meshtls-rustls = { path = "../../../meshtls/rustls", features = [
+linkerd-meshtls = { path = "../../../meshtls", features = [
     "test-util",
 ] }
 linkerd-tracing = { path = "../../../tracing", features = ["ansi"] }
 tokio = { version = "1", features = ["full"] }
-tracing = "0.1"
+tracing = { workspace = true }
 
 # Prevent this from interfering with workspaces
 [workspace]

linkerd/app/inbound/src/detect.rs

@@ -325,7 +325,7 @@ impl svc::Param<Remote<ServerAddr>> for Forward {
 impl svc::Param<transport::labels::Key> for Forward {
     fn param(&self) -> transport::labels::Key {
         transport::labels::Key::inbound_server(
-            self.tls.clone(),
+            self.tls.as_ref().map(|t| t.labels()),
             self.orig_dst_addr.into(),
             self.permit.labels.server.clone(),
         )
@@ -429,7 +429,7 @@ impl svc::Param<ServerLabel> for Http {
 impl svc::Param<transport::labels::Key> for Http {
     fn param(&self) -> transport::labels::Key {
         transport::labels::Key::inbound_server(
-            self.tls.status.clone(),
+            self.tls.status.as_ref().map(|t| t.labels()),
             self.tls.orig_dst_addr.into(),
             self.tls.policy.server_label(),
         )

linkerd/app/inbound/src/direct.rs

@@ -117,7 +117,7 @@ impl<N> Inbound<N> {
             let identity = rt
                 .identity
                 .server()
-                .with_alpn(vec![transport_header::PROTOCOL.into()])
+                .spawn_with_alpn(vec![transport_header::PROTOCOL.into()])
                 .expect("TLS credential store must be held");
 
             inner
@@ -311,9 +311,8 @@ impl Param<Remote<ServerAddr>> for AuthorizedLocalTcp {
 impl Param<transport::labels::Key> for AuthorizedLocalTcp {
     fn param(&self) -> transport::labels::Key {
         transport::labels::Key::inbound_server(
-            tls::ConditionalServerTls::Some(tls::ServerTls::Established {
+            tls::ConditionalServerTlsLabels::Some(tls::ServerTlsLabels::Established {
                 client_id: Some(self.client_id.clone()),
-                negotiated_protocol: None,
             }),
             self.addr.into(),
             self.permit.labels.server.clone(),
@@ -344,9 +343,8 @@ impl Param<Remote<ClientAddr>> for LocalHttp {
 impl Param<transport::labels::Key> for LocalHttp {
     fn param(&self) -> transport::labels::Key {
         transport::labels::Key::inbound_server(
-            tls::ConditionalServerTls::Some(tls::ServerTls::Established {
+            tls::ConditionalServerTlsLabels::Some(tls::ServerTlsLabels::Established {
                 client_id: Some(self.client.client_id.clone()),
-                negotiated_protocol: None,
             }),
             self.addr.into(),
             self.policy.server_label(),
@@ -435,6 +433,14 @@ impl Param<tls::ConditionalServerTls> for GatewayTransportHeader {
     }
 }
 
+impl Param<tls::ConditionalServerTlsLabels> for GatewayTransportHeader {
+    fn param(&self) -> tls::ConditionalServerTlsLabels {
+        tls::ConditionalServerTlsLabels::Some(tls::ServerTlsLabels::Established {
+            client_id: Some(self.client.client_id.clone()),
+        })
+    }
+}
+
 impl Param<tls::ClientId> for GatewayTransportHeader {
     fn param(&self) -> tls::ClientId {
         self.client.client_id.clone()

linkerd/app/inbound/src/http/router.rs

@@ -395,7 +395,7 @@ fn endpoint_labels(
 ) -> impl svc::ExtractParam<metrics::EndpointLabels, Logical> + Clone {
     move |t: &Logical| -> metrics::EndpointLabels {
         metrics::InboundEndpointLabels {
-            tls: t.tls.clone(),
+            tls: t.tls.as_ref().map(|t| t.labels()),
             authority: unsafe_authority_labels
                 .then(|| t.logical.as_ref().map(|d| d.as_http_authority()))
                 .flatten(),

linkerd/app/inbound/src/http/tests.rs

@@ -664,7 +664,7 @@ async fn grpc_response_class() {
     let response_total = metrics
         .get_response_total(
             &metrics::EndpointLabels::Inbound(metrics::InboundEndpointLabels {
-                tls: Target::meshed_h2().1,
+                tls: Target::meshed_h2().1.map(|t| t.labels()),
                 authority: None,
                 target_addr: "127.0.0.1:80".parse().unwrap(),
                 policy: metrics::RouteAuthzLabels {
@@ -762,7 +762,7 @@ async fn test_unsafe_authority_labels(
     let response_total = metrics
         .get_response_total(
             &metrics::EndpointLabels::Inbound(metrics::InboundEndpointLabels {
-                tls: Target::meshed_http1().1,
+                tls: Target::meshed_http1().1.as_ref().map(|t| t.labels()),
                 authority: expected_authority,
                 target_addr: "127.0.0.1:80".parse().unwrap(),
                 policy: metrics::RouteAuthzLabels {
@@ -861,12 +861,7 @@ fn grpc_status_server(
 
 #[tracing::instrument]
 fn connect_error() -> impl Fn(Remote<ServerAddr>) -> io::Result<io::BoxedIo> {
-    move |_| {
-        Err(io::Error::new(
-            io::ErrorKind::Other,
-            "server is not listening",
-        ))
-    }
+    move |_| Err(io::Error::other("server is not listening"))
 }
 
 #[tracing::instrument]

linkerd/app/inbound/src/lib.rs

@@ -113,10 +113,6 @@ impl<S> Inbound<S> {
         &self.runtime.identity
     }
 
-    pub fn proxy_metrics(&self) -> &metrics::Proxy {
-        &self.runtime.metrics.proxy
-    }
-
     /// A helper for gateways to instrument policy checks.
     pub fn authorize_http<N>(
         &self,

linkerd/app/inbound/src/metrics.rs

@@ -13,7 +13,7 @@ pub(crate) mod error;
 
 pub use linkerd_app_core::metrics::*;
 
-/// Holds outbound proxy metrics.
+/// Holds LEGACY inbound proxy metrics.
 #[derive(Clone, Debug)]
 pub struct InboundMetrics {
     pub http_authz: authz::HttpAuthzMetrics,
@@ -50,7 +50,7 @@ impl InboundMetrics {
     }
 }
 
-impl FmtMetrics for InboundMetrics {
+impl legacy::FmtMetrics for InboundMetrics {
     fn fmt_metrics(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.http_authz.fmt_metrics(f)?;
         self.http_errors.fmt_metrics(f)?;

linkerd/app/inbound/src/metrics/authz.rs

@@ -1,8 +1,9 @@
 use crate::policy::{AllowPolicy, HttpRoutePermit, Meta, ServerPermit};
 use linkerd_app_core::{
     metrics::{
-        metrics, Counter, FmtLabels, FmtMetrics, RouteAuthzLabels, RouteLabels, ServerAuthzLabels,
-        ServerLabel, TargetAddr, TlsAccept,
+        legacy::{Counter, FmtLabels, FmtMetrics},
+        metrics, RouteAuthzLabels, RouteLabels, ServerAuthzLabels, ServerLabel, TargetAddr,
+        TlsAccept,
     },
     tls,
     transport::OrigDstAddr,
@@ -67,7 +68,7 @@ pub struct HTTPLocalRateLimitLabels {
 #[derive(Debug, Hash, PartialEq, Eq)]
 struct Key<L> {
     target: TargetAddr,
-    tls: tls::ConditionalServerTls,
+    tls: tls::ConditionalServerTlsLabels,
     labels: L,
 }
 
@@ -80,7 +81,7 @@ type HttpLocalRateLimitKey = Key<HTTPLocalRateLimitLabels>;
 // === impl HttpAuthzMetrics ===
 
 impl HttpAuthzMetrics {
-    pub fn allow(&self, permit: &HttpRoutePermit, tls: tls::ConditionalServerTls) {
+    pub fn allow(&self, permit: &HttpRoutePermit, tls: tls::ConditionalServerTlsLabels) {
         self.0
             .allow
             .lock()
@@ -93,7 +94,7 @@ impl HttpAuthzMetrics {
         &self,
         labels: ServerLabel,
         dst: OrigDstAddr,
-        tls: tls::ConditionalServerTls,
+        tls: tls::ConditionalServerTlsLabels,
     ) {
         self.0
             .route_not_found
@@ -103,7 +104,12 @@ impl HttpAuthzMetrics {
             .incr();
     }
 
-    pub fn deny(&self, labels: RouteLabels, dst: OrigDstAddr, tls: tls::ConditionalServerTls) {
+    pub fn deny(
+        &self,
+        labels: RouteLabels,
+        dst: OrigDstAddr,
+        tls: tls::ConditionalServerTlsLabels,
+    ) {
         self.0
             .deny
             .lock()
@@ -116,7 +122,7 @@ impl HttpAuthzMetrics {
         &self,
         labels: HTTPLocalRateLimitLabels,
         dst: OrigDstAddr,
-        tls: tls::ConditionalServerTls,
+        tls: tls::ConditionalServerTlsLabels,
     ) {
         self.0
             .http_local_rate_limit
@@ -187,7 +193,7 @@ impl FmtMetrics for HttpAuthzMetrics {
 // === impl TcpAuthzMetrics ===
 
 impl TcpAuthzMetrics {
-    pub fn allow(&self, permit: &ServerPermit, tls: tls::ConditionalServerTls) {
+    pub fn allow(&self, permit: &ServerPermit, tls: tls::ConditionalServerTlsLabels) {
         self.0
             .allow
             .lock()
@@ -196,7 +202,7 @@ impl TcpAuthzMetrics {
             .incr();
     }
 
-    pub fn deny(&self, policy: &AllowPolicy, tls: tls::ConditionalServerTls) {
+    pub fn deny(&self, policy: &AllowPolicy, tls: tls::ConditionalServerTlsLabels) {
         self.0
             .deny
             .lock()
@@ -205,7 +211,7 @@ impl TcpAuthzMetrics {
             .incr();
     }
 
-    pub fn terminate(&self, policy: &AllowPolicy, tls: tls::ConditionalServerTls) {
+    pub fn terminate(&self, policy: &AllowPolicy, tls: tls::ConditionalServerTlsLabels) {
         self.0
             .terminate
             .lock()
@@ -246,18 +252,24 @@ impl FmtMetrics for TcpAuthzMetrics {
 
 impl FmtLabels for HTTPLocalRateLimitLabels {
     fn fmt_labels(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        self.server.fmt_labels(f)?;
-        if let Some(rl) = &self.rate_limit {
+        let Self {
+            server,
+            rate_limit,
+            scope,
+        } = self;
+
+        server.fmt_labels(f)?;
+        if let Some(rl) = rate_limit {
             write!(
                 f,
                 ",ratelimit_group=\"{}\",ratelimit_kind=\"{}\",ratelimit_name=\"{}\",ratelimit_scope=\"{}\"",
                 rl.group(),
                 rl.kind(),
                 rl.name(),
-                self.scope,
+                scope,
             )
         } else {
-            write!(f, ",ratelimit_scope=\"{}\"", self.scope)
+            write!(f, ",ratelimit_scope=\"{scope}\"")
         }
     }
 }
@@ -265,7 +277,7 @@ impl FmtLabels for HTTPLocalRateLimitLabels {
 // === impl Key ===
 
 impl<L> Key<L> {
-    fn new(labels: L, dst: OrigDstAddr, tls: tls::ConditionalServerTls) -> Self {
+    fn new(labels: L, dst: OrigDstAddr, tls: tls::ConditionalServerTlsLabels) -> Self {
         Self {
             tls,
             target: TargetAddr(dst.into()),
@@ -276,24 +288,30 @@ impl<L> Key<L> {
 
 impl<L: FmtLabels> FmtLabels for Key<L> {
     fn fmt_labels(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        (self.target, (&self.labels, TlsAccept(&self.tls))).fmt_labels(f)
+        let Self {
+            target,
+            tls,
+            labels,
+        } = self;
+
+        (target, (labels, TlsAccept(tls))).fmt_labels(f)
     }
 }
 
 impl ServerKey {
-    fn from_policy(policy: &AllowPolicy, tls: tls::ConditionalServerTls) -> Self {
+    fn from_policy(policy: &AllowPolicy, tls: tls::ConditionalServerTlsLabels) -> Self {
         Self::new(policy.server_label(), policy.dst_addr(), tls)
     }
 }
 
 impl RouteAuthzKey {
-    fn from_permit(permit: &HttpRoutePermit, tls: tls::ConditionalServerTls) -> Self {
+    fn from_permit(permit: &HttpRoutePermit, tls: tls::ConditionalServerTlsLabels) -> Self {
         Self::new(permit.labels.clone(), permit.dst, tls)
     }
 }
 
 impl ServerAuthzKey {
-    fn from_permit(permit: &ServerPermit, tls: tls::ConditionalServerTls) -> Self {
+    fn from_permit(permit: &ServerPermit, tls: tls::ConditionalServerTlsLabels) -> Self {
         Self::new(permit.labels.clone(), permit.dst, tls)
     }
 }

linkerd/app/inbound/src/metrics/error.rs

@@ -8,7 +8,7 @@ use crate::{
 };
 use linkerd_app_core::{
     errors::{FailFastError, LoadShedError},
-    metrics::FmtLabels,
+    metrics::legacy::FmtLabels,
     tls,
 };
 use std::fmt;

linkerd/app/inbound/src/metrics/error/http.rs

@@ -1,6 +1,9 @@
 use super::ErrorKind;
 use linkerd_app_core::{
-    metrics::{metrics, Counter, FmtMetrics, ServerLabel},
+    metrics::{
+        legacy::{Counter, FmtMetrics},
+        metrics, ServerLabel,
+    },
     svc::{self, stack::NewMonitor},
     transport::{labels::TargetAddr, OrigDstAddr},
     Error,

linkerd/app/inbound/src/metrics/error/tcp.rs

@@ -1,6 +1,9 @@
 use super::ErrorKind;
 use linkerd_app_core::{
-    metrics::{metrics, Counter, FmtMetrics},
+    metrics::{
+        legacy::{Counter, FmtMetrics},
+        metrics,
+    },
     svc::{self, stack::NewMonitor},
     transport::{labels::TargetAddr, OrigDstAddr},
     Error,

linkerd/app/inbound/src/policy/api.rs

@@ -33,7 +33,7 @@ static INVALID_POLICY: once_cell::sync::OnceCell<ServerPolicy> = once_cell::sync
 
 impl<S> Api<S>
 where
-    S: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error> + Clone,
+    S: tonic::client::GrpcService<tonic::body::Body, Error = Error> + Clone,
     S::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error> + Send + 'static,
 {
     pub(super) fn new(
@@ -57,7 +57,7 @@ where
 
 impl<S> Service<u16> for Api<S>
 where
-    S: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error>,
+    S: tonic::client::GrpcService<tonic::body::Body, Error = Error>,
     S: Clone + Send + Sync + 'static,
     S::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error> + Send + 'static,
     S::Future: Send + 'static,

linkerd/app/inbound/src/policy/config.rs

@@ -40,7 +40,7 @@ impl Config {
         limits: ReceiveLimits,
     ) -> impl GetPolicy + Clone + Send + Sync + 'static
     where
-        C: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error>,
+        C: tonic::client::GrpcService<tonic::body::Body, Error = Error>,
         C: Clone + Unpin + Send + Sync + 'static,
         C::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error>,
         C::ResponseBody: Send + 'static,

linkerd/app/inbound/src/policy/http.rs

@@ -248,8 +248,11 @@ impl<T, N> HttpPolicyService<T, N> {
                         );
                     }
                 }
-                self.metrics
-                    .deny(labels, self.connection.dst, self.connection.tls.clone());
+                self.metrics.deny(
+                    labels,
+                    self.connection.dst,
+                    self.connection.tls.as_ref().map(|t| t.labels()),
+                );
                 return Err(HttpRouteUnauthorized(()).into());
             }
         };
@@ -279,14 +282,19 @@ impl<T, N> HttpPolicyService<T, N> {
             }
         };
 
-        self.metrics.allow(&permit, self.connection.tls.clone());
+        self.metrics
+            .allow(&permit, self.connection.tls.as_ref().map(|t| t.labels()));
+
         Ok((permit, r#match, route))
     }
 
     fn mk_route_not_found(&self) -> Error {
         let labels = self.policy.server_label();
-        self.metrics
-            .route_not_found(labels, self.connection.dst, self.connection.tls.clone());
+        self.metrics.route_not_found(
+            labels,
+            self.connection.dst,
+            self.connection.tls.as_ref().map(|t| t.labels()),
+        );
         HttpRouteNotFound(()).into()
     }
 
@@ -306,7 +314,7 @@ impl<T, N> HttpPolicyService<T, N> {
                 self.metrics.ratelimit(
                     self.policy.ratelimit_label(&err),
                     self.connection.dst,
-                    self.connection.tls.clone(),
+                    self.connection.tls.as_ref().map(|t| t.labels()),
                 );
                 err.into()
             })

linkerd/app/inbound/src/policy/store.rs

@@ -74,7 +74,7 @@ impl<S> Store<S> {
         opaque_ports: RangeInclusiveSet<u16>,
     ) -> Self
     where
-        S: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error>,
+        S: tonic::client::GrpcService<tonic::body::Body, Error = Error>,
         S: Clone + Send + Sync + 'static,
         S::Future: Send,
         S::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error> + Send + 'static,
@@ -138,7 +138,7 @@ impl<S> Store<S> {
 
 impl<S> GetPolicy for Store<S>
 where
-    S: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error>,
+    S: tonic::client::GrpcService<tonic::body::Body, Error = Error>,
     S: Clone + Send + Sync + 'static,
     S::Future: Send,
     S::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error> + Send + 'static,

linkerd/app/inbound/src/policy/tcp.rs

@@ -77,7 +77,8 @@ where
                 // This new services requires a ClientAddr, so it must necessarily be built for each
                 // connection. So we can just increment the counter here since the service can only
                 // be used at most once.
-                self.metrics.allow(&permit, tls.clone());
+                self.metrics
+                    .allow(&permit, tls.as_ref().map(|t| t.labels()));
 
                 let inner = self.inner.new_service((permit, target));
                 TcpPolicy::Authorized(Authorized {
@@ -97,7 +98,7 @@ where
                     ?tls, %client,
                     "Connection denied"
                 );
-                self.metrics.deny(&policy, tls);
+                self.metrics.deny(&policy, tls.as_ref().map(|t| t.labels()));
                 TcpPolicy::Unauthorized(deny)
             }
         }
@@ -167,7 +168,7 @@ where
                                 %client,
                                 "Connection terminated due to policy change",
                             );
-                            metrics.terminate(&policy, tls);
+                            metrics.terminate(&policy, tls.as_ref().map(|t| t.labels()));
                             return Err(denied.into());
                         }
                     }

linkerd/app/inbound/src/policy/tcp/tests.rs

@@ -263,7 +263,7 @@ fn orig_dst_addr() -> OrigDstAddr {
     OrigDstAddr(([192, 0, 2, 2], 1000).into())
 }
 
-impl tonic::client::GrpcService<tonic::body::BoxBody> for MockSvc {
+impl tonic::client::GrpcService<tonic::body::Body> for MockSvc {
     type ResponseBody = linkerd_app_core::control::RspBody;
     type Error = Error;
     type Future = futures::future::Pending<Result<http::Response<Self::ResponseBody>, Self::Error>>;
@@ -275,7 +275,7 @@ impl tonic::client::GrpcService<tonic::body::BoxBody> for MockSvc {
         unreachable!()
     }
 
-    fn call(&mut self, _req: http::Request<tonic::body::BoxBody>) -> Self::Future {
+    fn call(&mut self, _req: http::Request<tonic::body::Body>) -> Self::Future {
         unreachable!()
     }
 }

linkerd/app/inbound/src/server.rs

@@ -27,7 +27,7 @@ impl Inbound<()> {
         limits: ReceiveLimits,
     ) -> impl policy::GetPolicy + Clone + Send + Sync + 'static
     where
-        C: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error>,
+        C: tonic::client::GrpcService<tonic::body::Body, Error = Error>,
         C: Clone + Unpin + Send + Sync + 'static,
         C::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error>,
         C::ResponseBody: Send + 'static,

linkerd/app/inbound/src/test_util.rs

@@ -3,9 +3,7 @@ pub use futures::prelude::*;
 use linkerd_app_core::{
     config,
     dns::Suffix,
-    drain, exp_backoff,
-    identity::rustls,
-    metrics,
+    drain, exp_backoff, identity, metrics,
     proxy::{
         http::{h1, h2},
         tap,
@@ -98,7 +96,7 @@ pub fn runtime() -> (ProxyRuntime, drain::Signal) {
     let (tap, _) = tap::new();
     let (metrics, _) = metrics::Metrics::new(std::time::Duration::from_secs(10));
     let runtime = ProxyRuntime {
-        identity: rustls::creds::default_for_test().1.into(),
+        identity: identity::creds::default_for_test().1,
         metrics: metrics.proxy,
         tap,
         span_sink: None,

linkerd/app/integration/Cargo.toml

@@ -23,38 +23,50 @@ h2 = { workspace = true }
 http = { workspace = true }
 http-body = { workspace = true }
 http-body-util = { workspace = true }
-hyper = { workspace = true, features = [
-    "http1",
-    "http2",
-    "client",
-    "server",
-] }
 hyper-util = { workspace = true, features = ["service"] }
 ipnet = "2"
 linkerd-app = { path = "..", features = ["allow-loopback"] }
 linkerd-app-core = { path = "../core" }
-linkerd-metrics = { path = "../../metrics", features = ["test_util"] }
-linkerd2-proxy-api = { workspace = true, features = [
-    "destination",
-    "arbitrary",
-] }
 linkerd-app-test = { path = "../test" }
+linkerd-meshtls = { path = "../../meshtls", features = ["test-util"] }
+linkerd-metrics = { path = "../../metrics", features = ["test_util"] }
+linkerd-rustls = { path = "../../rustls" }
 linkerd-tracing = { path = "../../tracing" }
 maplit = "1"
 parking_lot = "0.12"
 regex = "1"
-socket2 = "0.5"
-tokio = { version = "1", features = ["io-util", "net", "rt", "macros"] }
-tokio-stream = { version = "0.1", features = ["sync"] }
-tokio-rustls = { workspace = true }
 rustls-pemfile = "2.2"
+socket2 = "0.6"
+tokio = { version = "1", features = ["io-util", "net", "rt", "macros"] }
+tokio-rustls = { workspace = true }
+tokio-stream = { version = "0.1", features = ["sync"] }
+tonic = { workspace = true, features = ["transport", "router"], default-features = false }
 tower = { workspace = true, default-features = false }
-tonic = { workspace = true, features = ["transport"], default-features = false }
-tracing = "0.1"
-tracing-subscriber = { version = "0.3", default-features = false, features = [
+tracing = { workspace = true }
+
+[dependencies.hyper]
+workspace = true
+features = [
+    "client",
+    "http1",
+    "http2",
+    "server",
+]
+
+[dependencies.linkerd2-proxy-api]
+workspace = true
+features = [
+    "arbitrary",
+    "destination",
+]
+
+[dependencies.tracing-subscriber]
+version = "0.3"
+default-features = false
+features = [
     "fmt",
     "std",
-] }
+]
 
 [dev-dependencies]
 flate2 = { version = "1", default-features = false, features = [
@@ -62,8 +74,5 @@ flate2 = { version = "1", default-features = false, features = [
 ] }
 # Log streaming isn't enabled by default globally, but we want to test it.
 linkerd-app-admin = { path = "../admin", features = ["log-streaming"] }
-# No code from this crate is actually used; only necessary to enable the Rustls
-# implementation.
-linkerd-meshtls = { path = "../../meshtls", features = ["rustls"] }
 linkerd-tracing = { path = "../../tracing", features = ["ansi"] }
 serde_json = "1"

linkerd/app/integration/src/controller.rs

@@ -262,10 +262,7 @@ impl pb::destination_server::Destination for Controller {
                 }
 
                 tracing::warn!(?dst, ?updates, "request does not match");
-                let msg = format!(
-                    "expected get call for {:?} but got get call for {:?}",
-                    dst, req
-                );
+                let msg = format!("expected get call for {dst:?} but got get call for {req:?}");
                 calls.push_front(Dst::Call(dst, updates));
                 return Err(grpc::Status::new(grpc::Code::Unavailable, msg));
             }

linkerd/app/integration/src/identity.rs

@@ -8,7 +8,8 @@ use std::{
 };
 
 use linkerd2_proxy_api::identity as pb;
-use tokio_rustls::rustls::{self, pki_types::CertificateDer, server::WebPkiClientVerifier};
+use linkerd_rustls::get_default_provider;
+use tokio_rustls::rustls::{self, server::WebPkiClientVerifier};
 use tonic as grpc;
 
 pub struct Identity {
@@ -34,10 +35,6 @@ type Certify = Box<
         > + Send,
 >;
 
-static TLS_VERSIONS: &[&rustls::SupportedProtocolVersion] = &[&rustls::version::TLS13];
-static TLS_SUPPORTED_CIPHERSUITES: &[rustls::SupportedCipherSuite] =
-    &[rustls::crypto::ring::cipher_suite::TLS13_CHACHA20_POLY1305_SHA256];
-
 struct Certificates {
     pub leaf: Vec<u8>,
     pub intermediates: Vec<Vec<u8>>,
@@ -54,13 +51,13 @@ impl Certificates {
         let leaf = certs
             .next()
             .expect("no leaf cert in pemfile")
-            .map_err(|_| io::Error::new(io::ErrorKind::Other, "rustls error reading certs"))?
+            .map_err(|_| io::Error::other("rustls error reading certs"))?
             .as_ref()
             .to_vec();
         let intermediates = certs
             .map(|cert| cert.map(|cert| cert.as_ref().to_vec()))
             .collect::<Result<Vec<_>, _>>()
-            .map_err(|_| io::Error::new(io::ErrorKind::Other, "rustls error reading certs"))?;
+            .map_err(|_| io::Error::other("rustls error reading certs"))?;
 
         Ok(Certificates {
             leaf,
@@ -104,19 +101,16 @@ impl Identity {
         use std::io::Cursor;
         let mut roots = rustls::RootCertStore::empty();
         let trust_anchors = rustls_pemfile::certs(&mut Cursor::new(trust_anchors))
-            .map(|bytes| bytes.map(CertificateDer::from))
             .collect::<Result<Vec<_>, _>>()
             .expect("error parsing pemfile");
         let (added, skipped) = roots.add_parsable_certificates(trust_anchors);
         assert_ne!(added, 0, "trust anchors must include at least one cert");
         assert_eq!(skipped, 0, "no certs in pemfile should be invalid");
 
-        let mut provider = rustls::crypto::ring::default_provider();
-        provider.cipher_suites = TLS_SUPPORTED_CIPHERSUITES.to_vec();
-        let provider = Arc::new(provider);
+        let provider = get_default_provider();
 
         let client_config = rustls::ClientConfig::builder_with_provider(provider.clone())
-            .with_protocol_versions(TLS_VERSIONS)
+            .with_safe_default_protocol_versions()
             .expect("client config must be valid")
             .with_root_certificates(roots.clone())
             .with_no_client_auth();
@@ -128,7 +122,7 @@ impl Identity {
                 .expect("server verifier must be valid");
 
         let server_config = rustls::ServerConfig::builder_with_provider(provider)
-            .with_protocol_versions(TLS_VERSIONS)
+            .with_safe_default_protocol_versions()
             .expect("server config must be valid")
             .with_client_cert_verifier(client_cert_verifier)
             .with_single_cert(certs.chain(), key)
@@ -219,7 +213,7 @@ impl Controller {
             let f = f.take().expect("called twice?");
             let fut = f(req)
                 .map_ok(grpc::Response::new)
-                .map_err(|e| grpc::Status::new(grpc::Code::Internal, format!("{}", e)));
+                .map_err(|e| grpc::Status::new(grpc::Code::Internal, format!("{e}")));
             Box::pin(fut)
         });
         self.expect_calls.lock().push_back(func);

linkerd/app/integration/src/lib.rs

@@ -3,6 +3,7 @@
 #![warn(rust_2018_idioms, clippy::disallowed_methods, clippy::disallowed_types)]
 #![forbid(unsafe_code)]
 #![recursion_limit = "256"]
+#![allow(clippy::result_large_err)]
 
 mod test_env;
 
@@ -247,7 +248,7 @@ impl fmt::Display for HumanDuration {
         let secs = self.0.as_secs();
         let subsec_ms = self.0.subsec_nanos() as f64 / 1_000_000f64;
         if secs == 0 {
-            write!(fmt, "{}ms", subsec_ms)
+            write!(fmt, "{subsec_ms}ms")
         } else {
             write!(fmt, "{}s", secs as f64 + subsec_ms)
         }

linkerd/app/integration/src/policy.rs

@@ -302,7 +302,7 @@ impl Controller {
     }
 
     pub async fn run(self) -> controller::Listening {
-        let svc = grpc::transport::Server::builder()
+        let routes = grpc::service::Routes::default()
             .add_service(
                 inbound_server_policies_server::InboundServerPoliciesServer::new(Server(Arc::new(
                     self.inbound,
@@ -310,9 +310,9 @@ impl Controller {
             )
             .add_service(outbound_policies_server::OutboundPoliciesServer::new(
                 Server(Arc::new(self.outbound)),
-            ))
-            .into_service();
-        controller::run(RoutesSvc(svc), "support policy controller", None).await
+            ));
+
+        controller::run(RoutesSvc(routes), "support policy controller", None).await
     }
 }
 
@@ -525,7 +525,9 @@ impl Service<Request<hyper::body::Incoming>> for RoutesSvc {
 
     fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
         let Self(routes) = self;
-        routes.poll_ready(cx)
+        <grpc::service::Routes as Service<Request<UnsyncBoxBody<Bytes, grpc::Status>>>>::poll_ready(
+            routes, cx,
+        )
     }
 
     fn call(&mut self, req: Request<hyper::body::Incoming>) -> Self::Future {

linkerd/app/integration/src/proxy.rs

@@ -108,7 +108,7 @@ impl fmt::Debug for MockOrigDst {
         match self {
             Self::Addr(addr) => f
                 .debug_tuple("MockOrigDst::Addr")
-                .field(&format_args!("{}", addr))
+                .field(&format_args!("{addr}"))
                 .finish(),
             Self::Direct => f.debug_tuple("MockOrigDst::Direct").finish(),
             Self::None => f.debug_tuple("MockOrigDst::None").finish(),
@@ -416,9 +416,9 @@ async fn run(proxy: Proxy, mut env: TestEnv, random_ports: bool) -> Listening {
         use std::fmt::Write;
         let mut ports = inbound_default_ports.iter();
         if let Some(port) = ports.next() {
-            let mut var = format!("{}", port);
+            let mut var = format!("{port}");
             for port in ports {
-                write!(&mut var, ",{}", port).expect("writing to String should never fail");
+                write!(&mut var, ",{port}").expect("writing to String should never fail");
             }
             info!("{}={:?}", app::env::ENV_INBOUND_PORTS, var);
             env.put(app::env::ENV_INBOUND_PORTS, var);

linkerd/app/integration/src/tap.rs

@@ -137,28 +137,28 @@ impl TapEventExt for pb::TapEvent {
     fn request_init_authority(&self) -> &str {
         match self.event() {
             pb::tap_event::http::Event::RequestInit(ev) => &ev.authority,
-            e => panic!("not RequestInit event: {:?}", e),
+            e => panic!("not RequestInit event: {e:?}"),
         }
     }
 
     fn request_init_path(&self) -> &str {
         match self.event() {
             pb::tap_event::http::Event::RequestInit(ev) => &ev.path,
-            e => panic!("not RequestInit event: {:?}", e),
+            e => panic!("not RequestInit event: {e:?}"),
         }
     }
 
     fn response_init_status(&self) -> u16 {
         match self.event() {
             pb::tap_event::http::Event::ResponseInit(ev) => ev.http_status as u16,
-            e => panic!("not ResponseInit event: {:?}", e),
+            e => panic!("not ResponseInit event: {e:?}"),
         }
     }
 
     fn response_end_bytes(&self) -> u64 {
         match self.event() {
             pb::tap_event::http::Event::ResponseEnd(ev) => ev.response_bytes,
-            e => panic!("not ResponseEnd event: {:?}", e),
+            e => panic!("not ResponseEnd event: {e:?}"),
         }
     }
 
@@ -170,7 +170,7 @@ impl TapEventExt for pb::TapEvent {
                 }) => code,
                 _ => panic!("not Eos GrpcStatusCode: {:?}", ev.eos),
             },
-            ev => panic!("not ResponseEnd event: {:?}", ev),
+            ev => panic!("not ResponseEnd event: {ev:?}"),
         }
     }
 }

linkerd/app/integration/src/tests/discovery.rs

@@ -381,7 +381,7 @@ mod cross_version {
 }
 
 fn default_dst_name(port: u16) -> String {
-    format!("{}:{}", HOST, port)
+    format!("{HOST}:{port}")
 }
 
 fn send_default_dst(

linkerd/app/integration/src/tests/profile_dst_overrides.rs

@@ -63,7 +63,7 @@ async fn wait_for_profile_stage(client: &client::Client, metrics: &client::Clien
     for _ in 0i32..10 {
         assert_eq!(client.get("/load-profile").await, "");
         let m = metrics.get("/metrics").await;
-        let stage_metric = format!("rt_load_profile=\"{}\"", stage);
+        let stage_metric = format!("rt_load_profile=\"{stage}\"");
         if m.contains(stage_metric.as_str()) {
             break;
         }

linkerd/app/integration/src/tests/profiles.rs

@@ -88,12 +88,12 @@ impl TestBuilder {
         let port = srv.addr.port();
         let ctrl = controller::new();
 
-        let dst_tx = ctrl.destination_tx(format!("{}:{}", host, port));
+        let dst_tx = ctrl.destination_tx(format!("{host}:{port}"));
         dst_tx.send_addr(srv.addr);
 
         let ctrl = controller::new();
 
-        let dst_tx = ctrl.destination_tx(format!("{}:{}", host, port));
+        let dst_tx = ctrl.destination_tx(format!("{host}:{port}"));
         dst_tx.send_addr(srv.addr);
 
         let profile_tx = ctrl.profile_tx(srv.addr.to_string());

linkerd/app/integration/src/tests/telemetry.rs

@@ -1318,9 +1318,9 @@ async fn metrics_compression() {
                 body.copy_to_bytes(body.remaining()),
             ));
             let mut scrape = String::new();
-            decoder.read_to_string(&mut scrape).unwrap_or_else(|_| {
-                panic!("decode gzip (requested Accept-Encoding: {})", encoding)
-            });
+            decoder
+                .read_to_string(&mut scrape)
+                .unwrap_or_else(|_| panic!("decode gzip (requested Accept-Encoding: {encoding})"));
             scrape
         }
     };

linkerd/app/integration/src/tests/telemetry/log_stream.rs

@@ -26,7 +26,7 @@ async fn is_valid_json() {
     assert!(!json.is_empty());
 
     for obj in json {
-        println!("{}\n", obj);
+        println!("{obj}\n");
     }
 }
 
@@ -53,7 +53,7 @@ async fn query_is_valid_json() {
     assert!(!json.is_empty());
 
     for obj in json {
-        println!("{}\n", obj);
+        println!("{obj}\n");
     }
 }
 
@@ -74,12 +74,9 @@ async fn valid_get_does_not_error() {
 
     let json = logs.await.unwrap();
     for obj in json {
-        println!("{}\n", obj);
+        println!("{obj}\n");
         if obj.get("error").is_some() {
-            panic!(
-                "expected the log stream to contain no error responses!\njson = {}",
-                obj
-            );
+            panic!("expected the log stream to contain no error responses!\njson = {obj}");
         }
     }
 }
@@ -101,12 +98,9 @@ async fn valid_query_does_not_error() {
 
     let json = logs.await.unwrap();
     for obj in json {
-        println!("{}\n", obj);
+        println!("{obj}\n");
         if obj.get("error").is_some() {
-            panic!(
-                "expected the log stream to contain no error responses!\njson = {}",
-                obj
-            );
+            panic!("expected the log stream to contain no error responses!\njson = {obj}");
         }
     }
 }
@@ -142,9 +136,7 @@ async fn multi_filter() {
                 level.and_then(|value| value.as_str()),
                 Some("DEBUG") | Some("INFO") | Some("WARN") | Some("ERROR")
             ),
-            "level must be DEBUG, INFO, WARN, or ERROR\n level: {:?}\n  json: {:#?}",
-            level,
-            obj
+            "level must be DEBUG, INFO, WARN, or ERROR\n level: {level:?}\n  json: {obj:#?}"
         );
     }
 
@@ -175,7 +167,7 @@ async fn get_log_stream(
     let req = client
         .request_body(
             client
-                .request_builder(&format!("{}?{}", PATH, filter))
+                .request_builder(&format!("{PATH}?{filter}"))
                 .method(http::Method::GET)
                 .body(http_body_util::Full::new(Bytes::from(filter)))
                 .unwrap(),
@@ -231,7 +223,7 @@ where
                         }
                     }
                     Err(e) => {
-                        println!("body failed: {}", e);
+                        println!("body failed: {e}");
                         break;
                     }
                 };

linkerd/app/integration/src/tests/telemetry/tcp_errors.rs

@@ -80,10 +80,7 @@ impl Test {
                 .await
         };
 
-        env.put(
-            app::env::ENV_INBOUND_DETECT_TIMEOUT,
-            format!("{:?}", TIMEOUT),
-        );
+        env.put(app::env::ENV_INBOUND_DETECT_TIMEOUT, format!("{TIMEOUT:?}"));
 
         (self.set_env)(&mut env);
 
@@ -127,26 +124,6 @@ async fn inbound_timeout() {
         .await;
 }
 
-/// Tests that the detect metric is labeled and incremented on I/O error.
-#[tokio::test]
-async fn inbound_io_err() {
-    let _trace = trace_init();
-
-    let (proxy, metrics) = Test::default().run().await;
-    let client = crate::tcp::client(proxy.inbound);
-
-    let tcp_client = client.connect().await;
-
-    tcp_client.write(TcpFixture::HELLO_MSG).await;
-    drop(tcp_client);
-
-    metric(&proxy)
-        .label("error", "i/o")
-        .value(1u64)
-        .assert_in(&metrics)
-        .await;
-}
-
 /// Tests that the detect metric is not incremented when TLS is successfully
 /// detected.
 #[tokio::test]
@@ -192,44 +169,6 @@ async fn inbound_success() {
     metric.assert_in(&metrics).await;
 }
 
-/// Tests both of the above cases together.
-#[tokio::test]
-async fn inbound_multi() {
-    let _trace = trace_init();
-
-    let (proxy, metrics) = Test::default().run().await;
-    let client = crate::tcp::client(proxy.inbound);
-
-    let metric = metric(&proxy);
-    let timeout_metric = metric.clone().label("error", "tls detection timeout");
-    let io_metric = metric.label("error", "i/o");
-
-    let tcp_client = client.connect().await;
-
-    tokio::time::sleep(TIMEOUT + Duration::from_millis(15)) // just in case
-        .await;
-
-    timeout_metric.clone().value(1u64).assert_in(&metrics).await;
-    drop(tcp_client);
-
-    let tcp_client = client.connect().await;
-
-    tcp_client.write(TcpFixture::HELLO_MSG).await;
-    drop(tcp_client);
-
-    io_metric.clone().value(1u64).assert_in(&metrics).await;
-    timeout_metric.clone().value(1u64).assert_in(&metrics).await;
-
-    let tcp_client = client.connect().await;
-
-    tokio::time::sleep(TIMEOUT + Duration::from_millis(15)) // just in case
-        .await;
-
-    io_metric.clone().value(1u64).assert_in(&metrics).await;
-    timeout_metric.clone().value(2u64).assert_in(&metrics).await;
-    drop(tcp_client);
-}
-
 /// Tests that TLS detect failure metrics are collected for the direct stack.
 #[tokio::test]
 async fn inbound_direct_multi() {

linkerd/app/outbound/Cargo.toml

@@ -13,7 +13,7 @@ Configures and runs the outbound proxy
 default = []
 allow-loopback = []
 test-subscriber = []
-test-util = ["linkerd-app-test", "linkerd-meshtls-rustls/test-util", "dep:http-body"]
+test-util = ["linkerd-app-test", "linkerd-meshtls/test-util", "dep:http-body"]
 
 prometheus-client-rust-242 = [] # TODO
 
@@ -32,7 +32,7 @@ thiserror = "2"
 tokio = { version = "1", features = ["sync"] }
 tonic = { workspace = true, default-features = false }
 tower = { workspace = true, features = ["util"] }
-tracing = "0.1"
+tracing = { workspace = true }
 
 linkerd-app-core = { path = "../core" }
 linkerd-app-test = { path = "../test", optional = true }
@@ -42,7 +42,7 @@ linkerd-http-prom = { path = "../../http/prom" }
 linkerd-http-retry = { path = "../../http/retry" }
 linkerd-http-route = { path = "../../http/route" }
 linkerd-identity = { path = "../../identity" }
-linkerd-meshtls-rustls = { path = "../../meshtls/rustls", optional = true }
+linkerd-meshtls = { path = "../../meshtls", optional = true, default-features = false }
 linkerd-opaq-route = { path = "../../opaq-route" }
 linkerd-proxy-client-policy = { path = "../../proxy/client-policy", features = [
     "proto",
@@ -67,8 +67,7 @@ linkerd-app-test = { path = "../test", features = ["client-policy"] }
 linkerd-http-box = { path = "../../http/box" }
 linkerd-http-prom = { path = "../../http/prom", features = ["test-util"] }
 linkerd-io = { path = "../../io", features = ["tokio-test"] }
-linkerd-meshtls = { path = "../../meshtls", features = ["rustls"] }
-linkerd-meshtls-rustls = { path = "../../meshtls/rustls", features = [
+linkerd-meshtls = { path = "../../meshtls", features = [
     "test-util",
 ] }
 linkerd-mock-http-body = { path = "../../mock/http-body" }

linkerd/app/outbound/src/discover.rs

@@ -134,7 +134,13 @@ impl<N> Outbound<N> {
                                 .unwrap_or_else(|| (orig_dst, Default::default()));
                             // TODO(ver) We should be able to figure out resource coordinates for
                             // the endpoint?
-                            synthesize_forward_policy(&META, detect_timeout, queue, addr, meta)
+                            synthesize_forward_policy(
+                                &META,
+                                detect_timeout,
+                                queue,
+                                addr,
+                                meta.into(),
+                            )
                         },
                     );
                     return Ok((Some(profile), policy));
@@ -189,7 +195,7 @@ pub fn synthesize_forward_policy(
     timeout: Duration,
     queue: policy::Queue,
     addr: SocketAddr,
-    metadata: policy::EndpointMetadata,
+    metadata: Arc<policy::EndpointMetadata>,
 ) -> ClientPolicy {
     policy_for_backend(
         meta,

linkerd/app/outbound/src/http/concrete.rs

@@ -32,7 +32,7 @@ pub use self::balance::BalancerMetrics;
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub enum Dispatch {
     Balance(NameAddr, EwmaConfig),
-    Forward(Remote<ServerAddr>, Metadata),
+    Forward(Remote<ServerAddr>, Arc<Metadata>),
     /// A backend dispatcher that explicitly fails all requests.
     Fail {
         message: Arc<str>,
@@ -49,7 +49,7 @@ pub struct DispatcherFailed(Arc<str>);
 pub struct Endpoint<T> {
     addr: Remote<ServerAddr>,
     is_local: bool,
-    metadata: Metadata,
+    metadata: Arc<Metadata>,
     parent: T,
     queue: QueueConfig,
     close_server_connection_on_remote_proxy_error: bool,
@@ -279,6 +279,13 @@ impl<T> svc::Param<tls::ConditionalClientTls> for Endpoint<T> {
     }
 }
 
+impl<T> svc::Param<tls::ConditionalClientTlsLabels> for Endpoint<T> {
+    fn param(&self) -> tls::ConditionalClientTlsLabels {
+        let tls: tls::ConditionalClientTls = self.param();
+        tls.as_ref().map(tls::ClientTls::labels)
+    }
+}
+
 impl<T> svc::Param<http::Variant> for Endpoint<T>
 where
     T: svc::Param<http::Variant>,

linkerd/app/outbound/src/http/concrete/balance.rs

@@ -121,7 +121,7 @@ where
                         let http2 = http2.override_from(metadata.http2_client_params());
                         Endpoint {
                             addr: Remote(ServerAddr(addr)),
-                            metadata,
+                            metadata: metadata.into(),
                             is_local,
                             parent: target.parent,
                             queue: http_queue,

linkerd/app/outbound/src/http/endpoint/tests.rs

@@ -289,6 +289,12 @@ impl svc::Param<tls::ConditionalClientTls> for Endpoint {
     }
 }
 
+impl svc::Param<tls::ConditionalClientTlsLabels> for Endpoint {
+    fn param(&self) -> tls::ConditionalClientTlsLabels {
+        tls::ConditionalClientTlsLabels::None(tls::NoClientTls::Disabled)
+    }
+}
+
 impl svc::Param<Option<tcp::tagged_transport::PortOverride>> for Endpoint {
     fn param(&self) -> Option<tcp::tagged_transport::PortOverride> {
         None

linkerd/app/outbound/src/http/logical.rs

@@ -8,7 +8,7 @@ use linkerd_app_core::{
     transport::addrs::*,
     Addr, Error, Infallible, NameAddr, CANONICAL_DST_HEADER,
 };
-use std::{fmt::Debug, hash::Hash};
+use std::{fmt::Debug, hash::Hash, sync::Arc};
 use tokio::sync::watch;
 
 pub mod policy;
@@ -32,7 +32,7 @@ pub enum Routes {
 
     /// Fallback endpoint forwarding.
     // TODO(ver) Remove this variant when policy routes are fully wired up.
-    Endpoint(Remote<ServerAddr>, Metadata),
+    Endpoint(Remote<ServerAddr>, Arc<Metadata>),
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
@@ -64,7 +64,7 @@ enum RouterParams<T: Clone + Debug + Eq + Hash> {
     Profile(profile::Params<T>),
 
     // TODO(ver) Remove this variant when policy routes are fully wired up.
-    Endpoint(Remote<ServerAddr>, Metadata, T),
+    Endpoint(Remote<ServerAddr>, Arc<Metadata>, T),
 }
 
 // Only applies to requests with profiles.

linkerd/app/outbound/src/http/logical/policy/route/retry.rs

@@ -54,7 +54,7 @@ impl retry::Policy for RetryPolicy {
 
         if let Some(codes) = self.retryable_grpc_statuses.as_ref() {
             let grpc_status = Self::grpc_status(rsp);
-            let retryable = grpc_status.map_or(false, |c| codes.contains(c));
+            let retryable = grpc_status.is_some_and(|c| codes.contains(c));
             tracing::debug!(retryable, grpc.status = ?grpc_status);
             if retryable {
                 return true;

linkerd/app/outbound/src/ingress.rs

@@ -214,7 +214,7 @@ impl Outbound<()> {
                                 detect_timeout,
                                 queue,
                                 addr,
-                                meta,
+                                meta.into(),
                             );
                         }
 

linkerd/app/outbound/src/lib.rs

@@ -146,7 +146,7 @@ impl Outbound<()> {
         export_hostname_labels: bool,
     ) -> impl policy::GetPolicy
     where
-        C: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error>,
+        C: tonic::client::GrpcService<tonic::body::Body, Error = Error>,
         C: Clone + Unpin + Send + Sync + 'static,
         C::ResponseBody: proxy::http::Body<Data = tonic::codegen::Bytes, Error = Error>,
         C::ResponseBody: Send + 'static,

linkerd/app/outbound/src/metrics.rs

@@ -130,7 +130,7 @@ impl OutboundMetrics {
     }
 }
 
-impl FmtMetrics for OutboundMetrics {
+impl legacy::FmtMetrics for OutboundMetrics {
     fn fmt_metrics(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.http_errors.fmt_metrics(f)?;
         self.tcp_errors.fmt_metrics(f)?;
@@ -243,7 +243,7 @@ impl EncodeLabelSet for RouteRef {
 
 // === impl ConcreteLabels ===
 
-impl FmtLabels for ConcreteLabels {
+impl legacy::FmtLabels for ConcreteLabels {
     fn fmt_labels(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let ConcreteLabels(parent, backend) = self;
 

linkerd/app/outbound/src/metrics/error.rs

@@ -5,7 +5,7 @@ pub(crate) use self::{http::Http, tcp::Tcp};
 use crate::http::IdentityRequired;
 use linkerd_app_core::{
     errors::{FailFastError, LoadShedError},
-    metrics::FmtLabels,
+    metrics::legacy::FmtLabels,
     proxy::http::ResponseTimeoutError,
 };
 use std::fmt;

linkerd/app/outbound/src/metrics/error/http.rs

@@ -1,6 +1,9 @@
 use super::ErrorKind;
 use linkerd_app_core::{
-    metrics::{metrics, Counter, FmtMetrics},
+    metrics::{
+        legacy::{Counter, FmtMetrics},
+        metrics,
+    },
     svc, Error,
 };
 use parking_lot::RwLock;

linkerd/app/outbound/src/metrics/error/tcp.rs

@@ -1,6 +1,9 @@
 use super::ErrorKind;
 use linkerd_app_core::{
-    metrics::{metrics, Counter, FmtMetrics},
+    metrics::{
+        legacy::{Counter, FmtMetrics},
+        metrics,
+    },
     svc,
     transport::{labels::TargetAddr, OrigDstAddr},
     Error,

linkerd/app/outbound/src/opaq/concrete.rs

@@ -32,7 +32,7 @@ use tracing::info_span;
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub enum Dispatch {
     Balance(NameAddr, balance::EwmaConfig),
-    Forward(Remote<ServerAddr>, Metadata),
+    Forward(Remote<ServerAddr>, Arc<Metadata>),
     /// A backend dispatcher that explicitly fails all requests.
     Fail {
         message: Arc<str>,
@@ -57,7 +57,7 @@ pub struct ConcreteError {
 pub struct Endpoint<T> {
     addr: Remote<ServerAddr>,
     is_local: bool,
-    metadata: Metadata,
+    metadata: Arc<Metadata>,
     parent: T,
 }
 
@@ -196,7 +196,7 @@ impl<C> Outbound<C> {
                         let is_local = inbound_ips.contains(&addr.ip());
                         Endpoint {
                             addr: Remote(ServerAddr(addr)),
-                            metadata,
+                            metadata: metadata.into(),
                             is_local,
                             parent: target.parent,
                         }
@@ -419,3 +419,10 @@ impl<T> svc::Param<tls::ConditionalClientTls> for Endpoint<T> {
             ))
     }
 }
+
+impl<T> svc::Param<tls::ConditionalClientTlsLabels> for Endpoint<T> {
+    fn param(&self) -> tls::ConditionalClientTlsLabels {
+        let tls: tls::ConditionalClientTls = self.param();
+        tls.as_ref().map(tls::ClientTls::labels)
+    }
+}

linkerd/app/outbound/src/opaq/logical/tests.rs

@@ -160,9 +160,7 @@ async fn balances() {
     }
     assert!(
         seen0 && seen1,
-        "Both endpoints must be used; ep0={} ep1={}",
-        seen0,
-        seen1
+        "Both endpoints must be used; ep0={seen0} ep1={seen1}"
     );
 
     // When we remove the ep0, all traffic goes to ep1:
@@ -190,8 +188,7 @@ async fn balances() {
     task.abort();
     assert!(
         errors::is_caused_by::<FailFastError>(&*err),
-        "unexpected error: {}",
-        err
+        "unexpected error: {err}"
     );
     assert!(resolved.only_configured(), "Resolution must be reused");
 }

linkerd/app/outbound/src/policy/api.rs

@@ -33,7 +33,7 @@ static INVALID_POLICY: once_cell::sync::OnceCell<ClientPolicy> = once_cell::sync
 
 impl<S> Api<S>
 where
-    S: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error> + Clone,
+    S: tonic::client::GrpcService<tonic::body::Body, Error = Error> + Clone,
     S::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error> + Send + 'static,
 {
     pub(crate) fn new(
@@ -59,7 +59,7 @@ where
 
 impl<S> Service<Addr> for Api<S>
 where
-    S: tonic::client::GrpcService<tonic::body::BoxBody, Error = Error>,
+    S: tonic::client::GrpcService<tonic::body::Body, Error = Error>,
     S: Clone + Send + Sync + 'static,
     S::ResponseBody: http::Body<Data = tonic::codegen::Bytes, Error = Error> + Send + 'static,
     S::Future: Send + 'static,

linkerd/app/outbound/src/tcp/connect.rs

@@ -8,8 +8,8 @@ use std::task::{Context, Poll};
 
 #[derive(Clone, Debug)]
 pub struct Connect {
-    pub addr: Remote<ServerAddr>,
-    pub tls: tls::ConditionalClientTls,
+    addr: Remote<ServerAddr>,
+    tls: tls::ConditionalClientTls,
 }
 
 /// Prevents outbound connections on the loopback interface, unless the
@@ -77,6 +77,12 @@ where
 
 // === impl Connect ===
 
+impl Connect {
+    pub fn new(addr: Remote<ServerAddr>, tls: tls::ConditionalClientTls) -> Self {
+        Self { addr, tls }
+    }
+}
+
 impl svc::Param<Remote<ServerAddr>> for Connect {
     fn param(&self) -> Remote<ServerAddr> {
         self.addr
@@ -88,3 +94,14 @@ impl svc::Param<tls::ConditionalClientTls> for Connect {
         self.tls.clone()
     }
 }
+
+#[cfg(test)]
+impl Connect {
+    pub fn addr(&self) -> &Remote<ServerAddr> {
+        &self.addr
+    }
+
+    pub fn tls(&self) -> &tls::ConditionalClientTls {
+        &self.tls
+    }
+}

linkerd/app/outbound/src/tcp/tagged_transport.rs

@@ -67,10 +67,7 @@ where
         let tls: tls::ConditionalClientTls = ep.param();
         if let tls::ConditionalClientTls::None(reason) = tls {
             trace!(%reason, "Not attempting opaque transport");
-            let target = Connect {
-                addr: ep.param(),
-                tls,
-            };
+            let target = Connect::new(ep.param(), tls);
             return Box::pin(self.inner.connect(target).err_into::<Error>());
         }
 
@@ -109,10 +106,10 @@ where
 
         let protocol: Option<SessionProtocol> = ep.param();
 
-        let connect = self.inner.connect(Connect {
-            addr: Remote(ServerAddr((addr.ip(), connect_port).into())),
+        let connect = self.inner.connect(Connect::new(
+            Remote(ServerAddr((addr.ip(), connect_port).into())),
             tls,
-        });
+        ));
         Box::pin(async move {
             let (mut io, meta) = connect.await.map_err(Into::into)?;
 
@@ -203,9 +200,9 @@ mod test {
     ) -> impl Fn(Connect) -> futures::future::Ready<Result<(tokio_test::io::Mock, ConnectMeta), io::Error>>
     {
         move |ep| {
-            let Remote(ServerAddr(sa)) = ep.addr;
+            let Remote(ServerAddr(sa)) = ep.addr();
             assert_eq!(sa.port(), 4143);
-            assert!(ep.tls.is_some());
+            assert!(ep.tls().is_some());
             let buf = header.encode_prefaced_buf().expect("Must encode");
             let io = tokio_test::io::Builder::new()
                 .write(&buf[..])
@@ -225,9 +222,9 @@ mod test {
 
         let svc = TaggedTransport {
             inner: service_fn(|ep: Connect| {
-                let Remote(ServerAddr(sa)) = ep.addr;
+                let Remote(ServerAddr(sa)) = ep.addr();
                 assert_eq!(sa.port(), 4321);
-                assert!(ep.tls.is_none());
+                assert!(ep.tls().is_none());
                 let io = tokio_test::io::Builder::new().write(b"hello").build();
                 let meta = tls::ConnectMeta {
                     socket: Local(ClientAddr(([0, 0, 0, 0], 0).into())),

linkerd/app/outbound/src/test_util.rs

@@ -60,7 +60,7 @@ pub(crate) fn runtime() -> (ProxyRuntime, drain::Signal) {
     let (tap, _) = tap::new();
     let (metrics, _) = metrics::Metrics::new(std::time::Duration::from_secs(10));
     let runtime = ProxyRuntime {
-        identity: linkerd_meshtls_rustls::creds::default_for_test().1.into(),
+        identity: linkerd_meshtls::creds::default_for_test().1,
         metrics: metrics.proxy,
         tap,
         span_sink: None,

linkerd/app/outbound/src/tls/concrete.rs

@@ -31,7 +31,7 @@ use tracing::info_span;
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 pub enum Dispatch {
     Balance(NameAddr, balance::EwmaConfig),
-    Forward(Remote<ServerAddr>, Metadata),
+    Forward(Remote<ServerAddr>, Arc<Metadata>),
     /// A backend dispatcher that explicitly fails all requests.
     Fail {
         message: Arc<str>,
@@ -56,7 +56,7 @@ pub struct ConcreteError {
 pub struct Endpoint<T> {
     addr: Remote<ServerAddr>,
     is_local: bool,
-    metadata: Metadata,
+    metadata: Arc<Metadata>,
     parent: T,
 }
 
@@ -174,7 +174,7 @@ impl<C> Outbound<C> {
                         let is_local = inbound_ips.contains(&addr.ip());
                         Endpoint {
                             addr: Remote(ServerAddr(addr)),
-                            metadata,
+                            metadata: metadata.into(),
                             is_local,
                             parent: target.parent,
                         }
@@ -385,3 +385,10 @@ impl<T> svc::Param<tls::ConditionalClientTls> for Endpoint<T> {
             ))
     }
 }
+
+impl<T> svc::Param<tls::ConditionalClientTlsLabels> for Endpoint<T> {
+    fn param(&self) -> tls::ConditionalClientTlsLabels {
+        let tls: tls::ConditionalClientTls = self.param();
+        tls.as_ref().map(tls::ClientTls::labels)
+    }
+}

linkerd/app/outbound/src/tls/logical/tests.rs

@@ -11,13 +11,18 @@ use linkerd_proxy_client_policy::{self as client_policy, tls::sni};
 use parking_lot::Mutex;
 use std::{
     collections::HashMap,
+    marker::PhantomData,
     net::SocketAddr,
     sync::Arc,
     task::{Context, Poll},
     time::Duration,
 };
 use tokio::sync::watch;
-use tokio_rustls::rustls::pki_types::DnsName;
+use tokio_rustls::rustls::{
+    internal::msgs::codec::{Codec, Reader},
+    pki_types::DnsName,
+    InvalidMessage,
+};
 
 mod basic;
 
@@ -142,7 +147,7 @@ fn default_backend(addr: SocketAddr) -> client_policy::Backend {
             capacity: 100,
             failfast_timeout: Duration::from_secs(10),
         },
-        dispatcher: BackendDispatcher::Forward(addr, EndpointMetadata::default()),
+        dispatcher: BackendDispatcher::Forward(addr, EndpointMetadata::default().into()),
     }
 }
 
@@ -170,44 +175,57 @@ fn sni_route(backend: client_policy::Backend, sni: sni::MatchSni) -> client_poli
 // generates a sample ClientHello TLS message for testing
 fn generate_client_hello(sni: &str) -> Vec<u8> {
     use tokio_rustls::rustls::{
-        internal::msgs::{
-            base::Payload,
-            codec::{Codec, Reader},
-            enums::Compression,
-            handshake::{
-                ClientExtension, ClientHelloPayload, HandshakeMessagePayload, HandshakePayload,
-                Random, ServerName, SessionId,
-            },
-            message::{MessagePayload, PlainMessage},
-        },
-        CipherSuite, ContentType, HandshakeType, ProtocolVersion,
+        internal::msgs::{base::Payload, codec::Codec, message::PlainMessage},
+        ContentType, ProtocolVersion,
     };
 
     let sni = DnsName::try_from(sni.to_string()).unwrap();
     let sni = trim_hostname_trailing_dot_for_sni(&sni);
 
-    let mut server_name_bytes = vec![];
-    0u8.encode(&mut server_name_bytes); // encode the type first
-    (sni.as_ref().len() as u16).encode(&mut server_name_bytes); // then the length as u16
-    server_name_bytes.extend_from_slice(sni.as_ref().as_bytes()); // then the server name itself
+    // rustls has internal-only types that can encode a ClientHello, but they are mostly
+    // inaccessible and an unstable part of the public API anyway. Manually encode one here for
+    // testing only instead.
 
-    let server_name =
-        ServerName::read(&mut Reader::init(&server_name_bytes)).expect("Server name is valid");
+    let mut hs_payload_bytes = vec![];
+    1u8.encode(&mut hs_payload_bytes); // client hello ID
 
-    let hs_payload = HandshakeMessagePayload {
-        typ: HandshakeType::ClientHello,
-        payload: HandshakePayload::ClientHello(ClientHelloPayload {
-            client_version: ProtocolVersion::TLSv1_2,
-            random: Random::from([0; 32]),
-            session_id: SessionId::read(&mut Reader::init(&[0])).unwrap(),
-            cipher_suites: vec![CipherSuite::TLS_NULL_WITH_NULL_NULL],
-            compression_methods: vec![Compression::Null],
-            extensions: vec![ClientExtension::ServerName(vec![server_name])],
-        }),
+    let client_hello_body = {
+        let mut payload = LengthPayload::<U24>::empty();
+
+        payload.buf.extend_from_slice(&[0x03, 0x03]); // client version, TLSv1.2
+
+        payload.buf.extend_from_slice(&[0u8; 32]); // random
+
+        0u8.encode(&mut payload.buf); // session ID
+
+        LengthPayload::<u16>::from_slice(&[0x00, 0x00] /* TLS_NULL_WITH_NULL_NULL */)
+            .encode(&mut payload.buf);
+
+        LengthPayload::<u8>::from_slice(&[0x00] /* no compression */).encode(&mut payload.buf);
+
+        let extensions = {
+            let mut payload = LengthPayload::<u16>::empty();
+            0u16.encode(&mut payload.buf); // server name extension ID
+
+            let server_name_extension = {
+                let mut payload = LengthPayload::<u16>::empty();
+                let server_name = {
+                    let mut payload = LengthPayload::<u16>::empty();
+                    0u8.encode(&mut payload.buf); // DNS hostname ID
+                    LengthPayload::<u16>::from_slice(sni.as_ref().as_bytes())
+                        .encode(&mut payload.buf);
+                    payload
+                };
+                server_name.encode(&mut payload.buf);
+                payload
+            };
+            server_name_extension.encode(&mut payload.buf);
+            payload
+        };
+        extensions.encode(&mut payload.buf);
+        payload
     };
-
-    let mut hs_payload_bytes = Vec::default();
-    MessagePayload::handshake(hs_payload).encode(&mut hs_payload_bytes);
+    client_hello_body.encode(&mut hs_payload_bytes);
 
     let message = PlainMessage {
         typ: ContentType::Handshake,
@@ -218,6 +236,65 @@ fn generate_client_hello(sni: &str) -> Vec<u8> {
     message.into_unencrypted_opaque().encode()
 }
 
+#[derive(Debug)]
+struct LengthPayload<T> {
+    buf: Vec<u8>,
+    _boo: PhantomData<fn() -> T>,
+}
+
+impl<T> LengthPayload<T> {
+    fn empty() -> Self {
+        Self {
+            buf: vec![],
+            _boo: PhantomData,
+        }
+    }
+
+    fn from_slice(s: &[u8]) -> Self {
+        Self {
+            buf: s.to_vec(),
+            _boo: PhantomData,
+        }
+    }
+}
+
+impl Codec<'_> for LengthPayload<u8> {
+    fn encode(&self, bytes: &mut Vec<u8>) {
+        (self.buf.len() as u8).encode(bytes);
+        bytes.extend_from_slice(&self.buf);
+    }
+
+    fn read(_: &mut Reader<'_>) -> std::result::Result<Self, InvalidMessage> {
+        unimplemented!()
+    }
+}
+
+impl Codec<'_> for LengthPayload<u16> {
+    fn encode(&self, bytes: &mut Vec<u8>) {
+        (self.buf.len() as u16).encode(bytes);
+        bytes.extend_from_slice(&self.buf);
+    }
+
+    fn read(_: &mut Reader<'_>) -> std::result::Result<Self, InvalidMessage> {
+        unimplemented!()
+    }
+}
+
+#[derive(Debug)]
+struct U24;
+
+impl Codec<'_> for LengthPayload<U24> {
+    fn encode(&self, bytes: &mut Vec<u8>) {
+        let len = self.buf.len() as u32;
+        bytes.extend_from_slice(&len.to_be_bytes()[1..]);
+        bytes.extend_from_slice(&self.buf);
+    }
+
+    fn read(_: &mut Reader<'_>) -> std::result::Result<Self, InvalidMessage> {
+        unimplemented!()
+    }
+}
+
 fn trim_hostname_trailing_dot_for_sni(dns_name: &DnsName<'_>) -> DnsName<'static> {
     let dns_name_str = dns_name.as_ref();
 

linkerd/app/src/dst.rs

@@ -43,7 +43,7 @@ impl Config {
     ) -> Result<
         Dst<
             impl svc::Service<
-                    http::Request<tonic::body::BoxBody>,
+                    http::Request<tonic::body::Body>,
                     Response = http::Response<control::RspBody>,
                     Error = Error,
                     Future = impl Send,

linkerd/app/src/env.rs

@@ -83,8 +83,8 @@ pub enum ParseError {
     ),
     #[error("not a valid port range")]
     NotAPortRange,
-    #[error(transparent)]
-    AddrError(addr::Error),
+    #[error("{0}")]
+    AddrError(#[source] addr::Error),
     #[error("only two addresses are supported")]
     TooManyAddrs,
     #[error("not a valid identity name")]
@@ -233,8 +233,12 @@ pub const ENV_IDENTITY_IDENTITY_SERVER_ID: &str = "LINKERD2_PROXY_IDENTITY_SERVE
 pub const ENV_IDENTITY_IDENTITY_SERVER_NAME: &str = "LINKERD2_PROXY_IDENTITY_SERVER_NAME";
 
 // If this config is set, then the proxy will be configured to use Spire as identity
-// provider
+// provider. On Unix systems this needs to be a path to a UDS while on Windows - a
+// named pipe path.
+pub const ENV_IDENTITY_SPIRE_WORKLOAD_API_ADDRESS: &str =
+    "LINKERD2_PROXY_IDENTITY_SPIRE_WORKLOAD_API_ADDRESS";
 pub const ENV_IDENTITY_SPIRE_SOCKET: &str = "LINKERD2_PROXY_IDENTITY_SPIRE_SOCKET";
+
 pub const IDENTITY_SPIRE_BASE: &str = "LINKERD2_PROXY_IDENTITY_SPIRE";
 const DEFAULT_SPIRE_BACKOFF: ExponentialBackoff =
     ExponentialBackoff::new_unchecked(Duration::from_millis(100), Duration::from_secs(1), 0.1);
@@ -290,7 +294,7 @@ const DEFAULT_INBOUND_HTTP_FAILFAST_TIMEOUT: Duration = Duration::from_secs(1);
 const DEFAULT_INBOUND_DETECT_TIMEOUT: Duration = Duration::from_secs(10);
 const DEFAULT_INBOUND_CONNECT_TIMEOUT: Duration = Duration::from_millis(300);
 const DEFAULT_INBOUND_CONNECT_BACKOFF: ExponentialBackoff =
-    ExponentialBackoff::new_unchecked(Duration::from_millis(100), Duration::from_millis(500), 0.1);
+    ExponentialBackoff::new_unchecked(Duration::from_millis(100), Duration::from_secs(10), 0.1);
 
 const DEFAULT_OUTBOUND_TCP_QUEUE_CAPACITY: usize = 10_000;
 const DEFAULT_OUTBOUND_TCP_FAILFAST_TIMEOUT: Duration = Duration::from_secs(3);
@@ -299,7 +303,7 @@ const DEFAULT_OUTBOUND_HTTP_FAILFAST_TIMEOUT: Duration = Duration::from_secs(3);
 const DEFAULT_OUTBOUND_DETECT_TIMEOUT: Duration = Duration::from_secs(10);
 const DEFAULT_OUTBOUND_CONNECT_TIMEOUT: Duration = Duration::from_secs(1);
 const DEFAULT_OUTBOUND_CONNECT_BACKOFF: ExponentialBackoff =
-    ExponentialBackoff::new_unchecked(Duration::from_millis(100), Duration::from_millis(500), 0.1);
+    ExponentialBackoff::new_unchecked(Duration::from_millis(100), Duration::from_secs(60), 0.1);
 
 const DEFAULT_CONTROL_QUEUE_CAPACITY: usize = 100;
 const DEFAULT_CONTROL_FAILFAST_TIMEOUT: Duration = Duration::from_secs(10);
@@ -339,12 +343,12 @@ const DEFAULT_INBOUND_HTTP1_CONNECTION_POOL_IDLE_TIMEOUT: Duration = Duration::f
 // TODO(ver) This should be configurable at the load balancer level.
 const DEFAULT_OUTBOUND_HTTP1_CONNECTION_POOL_IDLE_TIMEOUT: Duration = Duration::from_secs(3);
 
-// By default, we don't limit the number of connections a connection pol may
-// use, as doing so can severely impact CPU utilization for applications with
-// many concurrent requests. It's generally preferable to use the MAX_IDLE_AGE
-// limitations to quickly drop idle connections.
-const DEFAULT_INBOUND_MAX_IDLE_CONNS_PER_ENDPOINT: usize = usize::MAX;
-const DEFAULT_OUTBOUND_MAX_IDLE_CONNS_PER_ENDPOINT: usize = usize::MAX;
+// By default, we limit the number of connections that may be opened per-host.
+// We pick a high number (10k) that shouldn't interfere with most workloads, but
+// will prevent issues with our outbound HTTP client from exhausting the file
+// descriptors available to the process.
+const DEFAULT_INBOUND_MAX_IDLE_CONNS_PER_ENDPOINT: usize = 10_000;
+const DEFAULT_OUTBOUND_MAX_IDLE_CONNS_PER_ENDPOINT: usize = 10_000;
 
 // These settings limit the number of requests that have not received responses,
 // including those buffered in the proxy and dispatched to the destination
@@ -909,8 +913,13 @@ pub fn parse_config<S: Strings>(strings: &S) -> Result<super::Config, EnvError>
     let identity = {
         let tls = tls?;
 
-        match strings.get(ENV_IDENTITY_SPIRE_SOCKET)? {
-            Some(socket) => match &tls.id {
+        match parse_deprecated(
+            strings,
+            ENV_IDENTITY_SPIRE_WORKLOAD_API_ADDRESS,
+            ENV_IDENTITY_SPIRE_SOCKET,
+            |s| Ok(s.to_string()),
+        )? {
+            Some(workload_api_addr) => match &tls.id {
                 // TODO: perform stricter SPIFFE ID validation following:
                 // https://github.com/spiffe/spiffe/blob/27b59b81ba8c56885ac5d4be73b35b9b3305fd7a/standards/SPIFFE-ID.md
                 identity::Id::Uri(uri)
@@ -919,7 +928,7 @@ pub fn parse_config<S: Strings>(strings: &S) -> Result<super::Config, EnvError>
                     identity::Config::Spire {
                         tls,
                         client: spire::Config {
-                            socket_addr: std::sync::Arc::new(socket),
+                            workload_api_addr: std::sync::Arc::new(workload_api_addr),
                             backoff: parse_backoff(
                                 strings,
                                 IDENTITY_SPIRE_BASE,
@@ -1108,11 +1117,11 @@ pub fn parse_backoff<S: Strings>(
     base: &str,
     default: ExponentialBackoff,
 ) -> Result<ExponentialBackoff, EnvError> {
-    let min_env = format!("LINKERD2_PROXY_{}_EXP_BACKOFF_MIN", base);
+    let min_env = format!("LINKERD2_PROXY_{base}_EXP_BACKOFF_MIN");
     let min = parse(strings, &min_env, parse_duration);
-    let max_env = format!("LINKERD2_PROXY_{}_EXP_BACKOFF_MAX", base);
+    let max_env = format!("LINKERD2_PROXY_{base}_EXP_BACKOFF_MAX");
     let max = parse(strings, &max_env, parse_duration);
-    let jitter_env = format!("LINKERD2_PROXY_{}_EXP_BACKOFF_JITTER", base);
+    let jitter_env = format!("LINKERD2_PROXY_{base}_EXP_BACKOFF_JITTER");
     let jitter = parse(strings, &jitter_env, parse_number::<f64>);
 
     match (min?, max?, jitter?) {
@@ -1247,7 +1256,7 @@ pub fn parse_linkerd_identity_config<S: Strings>(
             Ok((control, certify))
         }
         (addr, end_entity_dir, token, _minr, _maxr) => {
-            let s = format!("{0}_ADDR and {0}_NAME", ENV_IDENTITY_SVC_BASE);
+            let s = format!("{ENV_IDENTITY_SVC_BASE}_ADDR and {ENV_IDENTITY_SVC_BASE}_NAME");
             let svc_env: &str = s.as_str();
             for (unset, name) in &[
                 (addr.is_none(), svc_env),

linkerd/app/src/env/types.rs

@@ -172,11 +172,11 @@ mod tests {
     fn test_unit<F: Fn(u64) -> Duration>(unit: &str, to_duration: F) {
         for v in &[0, 1, 23, 456_789] {
             let d = to_duration(*v);
-            let text = format!("{}{}", v, unit);
-            assert_eq!(parse_duration(&text), Ok(d), "text=\"{}\"", text);
+            let text = format!("{v}{unit}");
+            assert_eq!(parse_duration(&text), Ok(d), "text=\"{text}\"");
 
-            let text = format!(" {}{}\t", v, unit);
-            assert_eq!(parse_duration(&text), Ok(d), "text=\"{}\"", text);
+            let text = format!(" {v}{unit}\t");
+            assert_eq!(parse_duration(&text), Ok(d), "text=\"{text}\"");
         }
     }
 
@@ -245,7 +245,7 @@ mod tests {
         fn p(s: &str) -> Result<Vec<String>, ParseError> {
             let mut sfxs = parse_dns_suffixes(s)?
                 .into_iter()
-                .map(|s| format!("{}", s))
+                .map(|s| format!("{s}"))
                 .collect::<Vec<_>>();
             sfxs.sort();
             Ok(sfxs)

linkerd/app/src/identity.rs

@@ -4,7 +4,8 @@ pub use linkerd_app_core::identity::{client, Id};
 use linkerd_app_core::{
     control, dns,
     identity::{
-        client::linkerd::Certify, creds, CertMetrics, Credentials, DerX509, Mode, WithCertMetrics,
+        client::linkerd::Certify, creds, watch as watch_identity, CertMetrics, Credentials,
+        DerX509, WithCertMetrics,
     },
     metrics::{prom, ControlHttp as ClientMetrics},
     Result,
@@ -109,7 +110,7 @@ impl Config {
                 }
             }
             Self::Spire { client, tls } => {
-                let addr = client.socket_addr.clone();
+                let addr = client.workload_api_addr.clone();
                 let spire = spire::client::Spire::new(tls.id.clone());
 
                 let (store, receiver, ready) = watch(tls, metrics.cert)?;
@@ -137,8 +138,7 @@ fn watch(
     watch::Receiver<bool>,
 )> {
     let (tx, ready) = watch::channel(false);
-    let (store, receiver) =
-        Mode::default().watch(tls.id, tls.server_name, &tls.trust_anchors_pem)?;
+    let (store, receiver) = watch_identity(tls.id, tls.server_name, &tls.trust_anchors_pem)?;
     let cred = WithCertMetrics::new(metrics, NotifyReady { store, tx });
     Ok((cred, receiver, ready))
 }

linkerd/app/src/lib.rs

@@ -19,9 +19,10 @@ use linkerd_app_core::{
     config::ServerConfig,
     control::{ControlAddr, Metrics as ControlMetrics},
     dns, drain,
-    metrics::{prom, FmtMetrics},
+    metrics::{legacy::FmtMetrics, prom},
     serve,
     svc::Param,
+    tls_info,
     transport::{addrs::*, listen::Bind},
     Error, ProxyRuntime,
 };
@@ -83,13 +84,13 @@ pub struct App {
     tap: tap::Tap,
 }
 
+// === impl Config ===
+
 impl Config {
     pub fn try_from_env() -> Result<Self, env::EnvError> {
         env::Env.try_config()
     }
-}
 
-impl Config {
     /// Build an application.
     ///
     /// It is currently required that this be run on a Tokio runtime, since some
@@ -251,9 +252,6 @@ impl Config {
             export_hostname_labels,
         );
 
-        let dst_addr = dst.addr.clone();
-        // registry.sub_registry_with_prefix("gateway"),
-
         let gateway = gateway::Gateway::new(gateway, inbound.clone(), outbound.clone()).stack(
             dst.resolve.clone(),
             dst.profiles.clone(),
@@ -304,6 +302,7 @@ impl Config {
             error!(%error, "Failed to register process metrics");
         }
         registry.register("proxy_build_info", "Proxy build info", BUILD_INFO.metric());
+        registry.register("rustls_info", "Proxy TLS info", tls_info::metric());
 
         let admin = {
             let identity = identity.receiver().server();
@@ -330,7 +329,7 @@ impl Config {
 
         Ok(App {
             admin,
-            dst: dst_addr,
+            dst: dst.addr,
             drain: drain_tx,
             identity,
             inbound_addr,
@@ -358,6 +357,8 @@ impl Config {
     }
 }
 
+// === impl App ===
+
 impl App {
     pub fn admin_addr(&self) -> Local<ServerAddr> {
         self.admin.listen_addr
@@ -396,7 +397,7 @@ impl App {
 
     pub fn tracing_addr(&self) -> Option<&ControlAddr> {
         match self.trace_collector {
-            trace_collector::TraceCollector::Disabled { .. } => None,
+            trace_collector::TraceCollector::Disabled => None,
             crate::trace_collector::TraceCollector::Enabled(ref oc) => Some(&oc.addr),
         }
     }

linkerd/app/src/policy.rs

@@ -46,7 +46,7 @@ impl Config {
     ) -> Result<
         Policy<
             impl svc::Service<
-                    http::Request<tonic::body::BoxBody>,
+                    http::Request<tonic::body::Body>,
                     Response = http::Response<control::RspBody>,
                     Error = Error,
                     Future = impl Send,

linkerd/app/src/spire.rs

@@ -4,40 +4,26 @@ use tokio::sync::watch;
 
 pub use linkerd_app_core::identity::client::spire as client;
 
-#[cfg(target_os = "linux")]
-const UNIX_PREFIX: &str = "unix:";
-#[cfg(target_os = "linux")]
 const TONIC_DEFAULT_URI: &str = "http://[::]:50051";
 
 #[derive(Clone, Debug)]
 pub struct Config {
-    pub socket_addr: Arc<String>,
+    pub workload_api_addr: Arc<String>,
     pub backoff: ExponentialBackoff,
 }
 
 // Connects to SPIRE workload API via Unix Domain Socket
 pub struct Client {
-    #[cfg_attr(not(target_os = "linux"), allow(dead_code))]
     config: Config,
 }
 
 // === impl Client ===
-
-#[cfg(target_os = "linux")]
 impl From<Config> for Client {
     fn from(config: Config) -> Self {
         Self { config }
     }
 }
 
-#[cfg(not(target_os = "linux"))]
-impl From<Config> for Client {
-    fn from(_: Config) -> Self {
-        panic!("Spire is supported on Linux only")
-    }
-}
-
-#[cfg(target_os = "linux")]
 impl tower::Service<()> for Client {
     type Response = tonic::Response<watch::Receiver<client::SvidUpdate>>;
     type Error = Error;
@@ -51,25 +37,43 @@ impl tower::Service<()> for Client {
     }
 
     fn call(&mut self, _req: ()) -> Self::Future {
-        let socket = self.config.socket_addr.clone();
+        let addr = self.config.workload_api_addr.clone();
         let backoff = self.config.backoff;
         Box::pin(async move {
-            use tokio::net::UnixStream;
             use tonic::transport::{Endpoint, Uri};
 
-            // Strip the 'unix:' prefix for tonic compatibility.
-            let stripped_path = socket
-                .strip_prefix(UNIX_PREFIX)
-                .unwrap_or(socket.as_str())
-                .to_string();
-
             // We will ignore this uri because uds do not use it
             // if your connector does use the uri it will be provided
             // as the request to the `MakeConnection`.
             let chan = Endpoint::try_from(TONIC_DEFAULT_URI)?
                 .connect_with_connector(tower::util::service_fn(move |_: Uri| {
-                    use futures::TryFutureExt;
-                    UnixStream::connect(stripped_path.clone()).map_ok(hyper_util::rt::TokioIo::new)
+                    #[cfg(unix)]
+                    {
+                        use futures::TryFutureExt;
+
+                        // The 'unix:' scheme must be stripped from socket paths.
+                        let path = addr.strip_prefix("unix:").unwrap_or(addr.as_str());
+
+                        tokio::net::UnixStream::connect(path.to_string())
+                            .map_ok(hyper_util::rt::TokioIo::new)
+                    }
+
+                    #[cfg(windows)]
+                    {
+                        use tokio::net::windows::named_pipe;
+                        let named_pipe_path = addr.clone();
+                        let client = named_pipe::ClientOptions::new()
+                            .open(named_pipe_path.as_str())
+                            .map(hyper_util::rt::TokioIo::new);
+
+                        futures::future::ready(client)
+                    }
+
+                    #[cfg(not(any(unix, windows)))]
+                    {
+                        compile_error!("Spire is supported only on Windows and Unix systems.");
+                        futures::future::pending()
+                    }
                 }))
                 .await?;
 
@@ -80,21 +84,3 @@ impl tower::Service<()> for Client {
         })
     }
 }
-
-#[cfg(not(target_os = "linux"))]
-impl tower::Service<()> for Client {
-    type Response = tonic::Response<watch::Receiver<client::SvidUpdate>>;
-    type Error = Error;
-    type Future = futures::future::BoxFuture<'static, Result<Self::Response, Self::Error>>;
-
-    fn poll_ready(
-        &mut self,
-        _cx: &mut std::task::Context<'_>,
-    ) -> std::task::Poll<Result<(), Self::Error>> {
-        unimplemented!("Spire is supported on Linux only")
-    }
-
-    fn call(&mut self, _req: ()) -> Self::Future {
-        unimplemented!("Spire is supported on Linux only")
-    }
-}

linkerd/app/src/trace_collector/oc_collector.rs

@@ -6,7 +6,7 @@ use linkerd_opencensus::{self as opencensus, metrics, proto};
 use std::{collections::HashMap, time::SystemTime};
 use tokio::sync::mpsc;
 use tokio_stream::wrappers::ReceiverStream;
-use tonic::{body::BoxBody, client::GrpcService};
+use tonic::{body::Body as TonicBody, client::GrpcService};
 use tracing::Instrument;
 
 pub(super) fn create_collector<S>(
@@ -18,7 +18,7 @@ pub(super) fn create_collector<S>(
     legacy_metrics: metrics::Registry,
 ) -> EnabledCollector
 where
-    S: GrpcService<BoxBody> + Clone + Send + 'static,
+    S: GrpcService<TonicBody> + Clone + Send + 'static,
     S::Error: Into<Error>,
     S::Future: Send,
     S::ResponseBody: Body<Data = tonic::codegen::Bytes> + Send + 'static,