Set up a few code owners

[DilumAluthge]

No description provided.

[DilumAluthge]

Any committer should feel free to add themselves as code owners for their areas of expertise - just make a PR to edit the .github/CODEOWNERS file.

Here's the syntax for the CODEOWNERS file: https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-code-owners#codeowners-syntax

[ViralBShah]

Is it possible to create teams of people, and then delegate parts of the codebase to the different teams in the CODEOWNERS?

[DilumAluthge]

Is it possible to create teams of people, and then delegate parts of the codebase to the different teams in the CODEOWNERS?

Definitely!

[simeonschaub]

I am not sure this is all that useful since almost any PR adds some tests.

[ViralBShah]

My thought was to see how useful this feature is and get it calibrated.

[simeonschaub]

Perhaps this should be a bit more fine-grained? I'd be comfortable reviewing frontend changes, but likely won't be able to contribute much if it touches codegen or parts of the C API. Also should perhaps add base/compiler?

[ViralBShah]

What do you think of my suggestion in #40925 (comment)

[simeonschaub]

Yeah, maybe. Although especially for some files in base this might be a bit of a noisy measure and it might be better for folks to be able to opt in manually.

[ViralBShah]

Won't people's global preferences on notifications anyways override this?

[simeonschaub]

I meant noisy here mostly in terms of that it might be rather arbitrary who is assigned to a file or not, but perhaps that's something we should just try and then see how it goes.

[ViralBShah]

Maybe we should generate this file automatically based on the interesection set of git blame authors and which of those are committers on julialang. And then maybe pick top 3.

[DilumAluthge]

Also, note that later lines in the CODEOWNERS file override earlier lines. So e.g. if you have this:

*       @foo 
*.js    @bar 

If you have a PR that only modifies .js files, then @bar will be pinged, but @foo will not be pinged.

[DilumAluthge]

Maybe we should generate this file automatically based on the interesection set of git blame authors and which of those are committers on julialang. And then maybe pick top 3.

I think this would work well.

And we can always manually edit the result. So e.g. someone can choose to remove themselves from the file if they don't like getting the pings.

[DilumAluthge]

For now, we've pared down a bit: #40929