opentelemetry-dotnet/CONTRIBUTING.md

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# Contributing to opentelemetry-dotnet
The OpenTelemetry .NET special interest group (SIG) meets regularly. See the
OpenTelemetry [community](https://github.com/open-telemetry/community#net-sdk)
repo for information on this and other language SIGs.
See the [public meeting
notes](https://docs.google.com/document/d/1yjjD6aBcLxlRazYrawukDgrhZMObwHARJbB9glWdHj8/edit?usp=sharing)
for a summary description of past meetings. To request edit access, join the
meeting or get in touch on
[Gitter](https://gitter.im/open-telemetry/opentelemetry-dotnet).
Even though, anybody can contribute, there are benefits of being a member of our
community. See to the [community membership
document](https://github.com/open-telemetry/community/blob/main/community-membership.md)
on how to become a
[**Member**](https://github.com/open-telemetry/community/blob/main/community-membership.md#member),
[**Approver**](https://github.com/open-telemetry/community/blob/main/community-membership.md#approver)
and
[**Maintainer**](https://github.com/open-telemetry/community/blob/main/community-membership.md#maintainer).
## Find a Buddy and Get Started Quickly
If you are looking for someone to help you find a starting point and be a
resource for your first contribution, join our Gitter and find a buddy!
1. Join [Gitter.im](https://gitter.im) and join our [chat
room](https://gitter.im/open-telemetry/opentelemetry-dotnet).
2. Post in the room with an introduction to yourself, what area you are
interested in (check issues marked with [help
wanted](https://github.com/open-telemetry/opentelemetry-dotnet/labels/help%20wanted)),
and say you are looking for a buddy. We will match you with someone who has
experience in that area.
Your OpenTelemetry buddy is your resource to talk to directly on all aspects of
contributing to OpenTelemetry: providing context, reviewing PRs, and helping
those get merged. Buddies will not be available 24/7, but is committed to
responding during their normal contribution hours.
## Development Environment
You can contribute to this project from a Windows, macOS or Linux machine.
On all platforms, the minimum requirements are:
* Git client and command line tools.
* .NET Core 3.1+
### Linux or MacOS
* Visual Studio for Mac or Visual Studio Code
Mono might be required by your IDE but is not required by this project. This is
because unit tests targeting .NET Framework (i.e: `net46`) are disabled outside
of Windows.
### Windows
* Visual Studio 2017+ or Visual Studio Code
* .NET Framework 4.6+
### Public API
It is critical to keep public API surface small and clean. This repository is
using `Microsoft.CodeAnalysis.PublicApiAnalyzers` to validate the public APIs.
This analyzer will check if you changed a public property/method so the change
will be easily spotted in pull request. It will also ensure that OpenTelemetry
doesn't expose APIs outside of the library primary concerns like a generic
helper methods.
#### How to enable and configure
* Create a folder in your project called `.publicApi` with the frameworks that
as folders you target.
* Create two files called `PublicAPI.Shipped.txt` and `PublicAPI.Unshipped.txt`
in each framework that you target.
* Add the following lines to your csproj:
```xml
<ItemGroup>
<AdditionalFiles
Include=".publicApi\$(TargetFramework)\PublicAPI.Shipped.txt" />
<AdditionalFiles
Include=".publicApi\$(TargetFramework)\PublicAPI.Unshipped.txt" />
</ItemGroup>
```
* Use
[IntelliSense](https://docs.microsoft.com/visualstudio/ide/using-intellisense)
to update the publicApi files.
## Pull Requests
### How to Send Pull Requests
Everyone is welcome to contribute code to `opentelemetry-dotnet` via GitHub pull
requests (PRs).
To create a new PR, fork the project in GitHub and clone the upstream repo:
```sh
git clone https://github.com/open-telemetry/opentelemetry-dotnet.git
```
Navigate to the repo root:
```sh
cd opentelemetry-dotnet
```
Add your fork as an origin:
```sh
git remote add fork https://github.com/YOUR_GITHUB_USERNAME/opentelemetry-dotnet.git
```
Run tests:
```sh
dotnet test
```
If you made changes to the Markdown documents (`*.md` files), install the latest
[`markdownlint-cli`](https://github.com/igorshubovych/markdownlint-cli) and run:
```sh
markdownlint .
```
Check out a new branch, make modifications and push the branch to your fork:
```sh
$ git checkout -b feature
# edit files
$ git commit
$ git push fork feature
```
Open a pull request against the main `opentelemetry-dotnet` repo.
### How to Receive Comments
* If the PR is not ready for review, please mark it as
[`draft`](https://github.blog/2019-02-14-introducing-draft-pull-requests/).
* Make sure CLA is signed and CI is clear.
### How to Get PRs Merged
A PR is considered to be **ready to merge** when:
* It has received approval from
[Approvers](https://github.com/open-telemetry/community/blob/main/community-membership.md#approver).
/
[Maintainers](https://github.com/open-telemetry/community/blob/main/community-membership.md#maintainer).
* Major feedbacks are resolved.
* It has been open for review for at least one working day. This gives people
reasonable time to review.
* Trivial change (typo, cosmetic, doc, etc.) doesn't have to wait for one day.
* Urgent fix can take exception as long as it has been actively communicated.
Any Maintainer can merge the PR once it is **ready to merge**. Note, that some
PR may not be merged immediately if repo is being in process of a major release
and the new feature doesn't fit it.
## Design Choices
As with other OpenTelemetry clients, opentelemetry-dotnet follows the
[opentelemetry-specification](https://github.com/open-telemetry/opentelemetry-specification).
It's especially valuable to read through the [library
guidelines](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/library-guidelines.md).
### Focus on Capabilities, Not Structure Compliance
OpenTelemetry is an evolving specification, one where the desires and use cases
are clear, but the method to satisfy those uses cases are not.
As such, contributions should provide functionality and behavior that conforms
to the specification, but the interface and structure is flexible.
It is preferable to have contributions follow the idioms of the language rather
than conform to specific API names or argument patterns in the spec.
For a deeper discussion, see [this spec
issue](https://github.com/open-telemetry/opentelemetry-specification/issues/165).
## Style Guide
This project includes a [`.editorconfig`](./.editorconfig) file which is
supported by all the IDEs/editor mentioned above. It works with the IDE/editor
only and does not affect the actual build of the project.
This repository also includes stylecop ruleset files under the `./build` folder.
These files are used to configure the _StyleCop.Analyzers_ which runs during
build. Breaking the rules will result in a build failure.