[Instrumentation.Process] Add schema URL

[martincostello]

Contributes to #4064.

Changes

• Add schema URL to metrics.
• Removed the process.cpu.count metric.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.82%. Comparing base (a545405) to head (b819f87).
⚠️ Report is 59 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4088      +/-   ##
==========================================
- Coverage   73.85%   73.82%   -0.03%     
==========================================
  Files         459      459              
  Lines       18327    18307      -20     
==========================================
- Hits        13535    13516      -19     
+ Misses       4792     4791       -1     

Flag	Coverage Δ
unittests-Instrumentation.Process	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...entation.Process/MeterProviderBuilderExtensions.cs	100.00% <100.00%> (ø)
...elemetry.Instrumentation.Process/ProcessMetrics.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[Copilot]

Pull request overview

Adds OpenTelemetry schema URL (and scope version via MeterOptions.Version) to Process instrumentation metrics to align with the repo-wide effort in #4064.

Changes:

• Create the Process instrumentation Meter via shared MeterFactory to populate TelemetrySchemaUrl and Version.
• Update AddProcessInstrumentation to register the meter by MeterInstance.Name.
• Extend unit tests to assert exported metrics include MeterVersion and a schema URL prefix; update changelog.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/OpenTelemetry.Instrumentation.Process.Tests/ProcessMetricsTests.cs	Adds assertions validating MeterVersion and MeterSchemaUrl are present on exported metrics.
src/OpenTelemetry.Instrumentation.Process/ProcessMetrics.cs	Switches meter creation to shared factory with semantic conventions version to attach schema URL/version.
src/OpenTelemetry.Instrumentation.Process/OpenTelemetry.Instrumentation.Process.csproj	Links in shared MeterFactory.cs for this instrumentation.
src/OpenTelemetry.Instrumentation.Process/MeterProviderBuilderExtensions.cs	Registers the meter using ProcessMetrics.MeterInstance.Name.
src/OpenTelemetry.Instrumentation.Process/CHANGELOG.md	Documents the added scope version and schema URL behavior.

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[github-actions]

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

[Kielek]

It is not fully true.

process.cpu.count is not defined in the otel spec.
I think that we should drop it first and then merge it.

Ultimate solution, include metrics:
https://github.com/dotnet/runtime/blob/a534a1c68e656b07d16015e2f46fa55b25bfd0b9/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/RuntimeMetrics.cs#L143-L147

for .NET Fx + .NET8 in Runtime Instrumentation package + link changelog to use other packages during migration.

[martincostello]

I think that we should drop it

Done.

[martincostello]

open-telemetry/semantic-conventions#651 is tracking the ask to make this part of the actual Semantic Conventions.

[Kielek]

On the other hand we have already https://github.com/open-telemetry/semantic-conventions/blob/main/docs/runtime/dotnet-metrics.md#metric-dotnetprocesscpucount

I would not declare this metric as part of 1.25.0, as it is not defined there.

[martincostello]

I would not declare this metric as part of 1.25.0, as it is not defined there.

It isn't because it's been deleted? If we don't emit it it isn't associated with that schema URL.

[Kielek]

I missed that you have already committed fix here.