resource: Allow service.version to be auto-populated by SDKs

[CodeBlanch]

Changes

• Allow SDKs to offer an opt-in feature to auto-populate service.version if there are standard ways to do it for the SIG

Details

.NET has some built-in mechanisms for versioning assemblies: Assembly versioning.

What this PR seeks to do is make it allowable for SDKs to populate service.version from known sources if the user explicitly enables/requests auto-population.

Here is a PoC branch I did of what this might look like in .NET SDK: https://github.com/open-telemetry/opentelemetry-dotnet/compare/main...CodeBlanch:resource-service-version-auto-resolution?expand=1

This support was requested by a user: open-telemetry/opentelemetry-dotnet#5703.

Merge requirement checklist

• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
  • If your PR does not need a change log, start the PR title with [chore]
• schema-next.yaml updated with changes to existing conventions.

[lmolkova]

LGTM!

[trask]

since this is SDK spec, should it be in opentelemetry-specification instead?

[joaopgrassi]

since this is SDK spec, should it be in opentelemetry-specification instead?

Yeah I was thinking the same when I was reviewing. It feels similar to telemetry sdk attributes https://github.com/open-telemetry/semantic-conventions/blob/main/docs/resource/README.md#telemetry-sdk.

[lmolkova]

since this is SDK spec, should it be in opentelemetry-specification instead?

Yeah I was thinking the same when I was reviewing. It feels similar to telemetry sdk attributes https://github.com/open-telemetry/semantic-conventions/blob/main/docs/resource/README.md#telemetry-sdk.

FWIW spec doesn't mention service.version much https://github.com/search?q=repo%3Aopen-telemetry%2Fopentelemetry-specification+service.version&type=code

And delegates the definition of service.name to semconv.

I feel we need to update semconv anyway.

Let's bring it up in Monday SemConv and/or Tue Spec call to highlight this change and discuss whether we should have something in the spec about service.*.

[jsuereth]

This normative language belongs here: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/resource/README.md#semantic-attributes-with-sdk-provided-default-value

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.