[AspNetCore] Add schema URL to traces

[martincostello]

Contributes to #4064.

Changes

• Add schema URL to the ActivitySource use for netstandard2.0.
• Remove redundant test code.

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

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 75.92%. Comparing base (fd2c666) to head (0c76fe2).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...eInstrumentationTracerProviderBuilderExtensions.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4066      +/-   ##
==========================================
- Coverage   75.93%   75.92%   -0.01%     
==========================================
  Files         466      466              
  Lines       18635    18633       -2     
==========================================
- Hits        14150    14148       -2     
  Misses       4485     4485              

Flag	Coverage Δ
unittests-Instrumentation.AspNet	76.99% <ø> (ø)
unittests-Instrumentation.AspNetCore	70.62% <66.66%> (-0.18%)	⬇️

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

Files with missing lines	Coverage Δ
...tation.AspNetCore/Implementation/HttpInListener.cs	74.17% <100.00%> (-0.34%)	⬇️
...eInstrumentationTracerProviderBuilderExtensions.cs	95.55% <0.00%> (ø)

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[Copilot]

Pull request overview

This PR updates the ASP.NET Core instrumentation to attach an OpenTelemetry schema URL to the ActivitySource used in the legacy (non-.NET 7+) tracing path, and cleans up conditional compilation in related unit tests.

Changes:

• Create HttpInListener.ActivitySource via ActivitySourceOptions to set TelemetrySchemaUrl (and use package version via GetPackageVersion()).
• Update tracer provider source registration to reference HttpInListener.ActivitySource.Name in the legacy path.
• Remove redundant #if NET guards in test code.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/OpenTelemetry.Instrumentation.AspNetCore.Tests/RouteTests/TestApplication/TestApplicationFactory.cs	Removes #if NET around Minimal API MapGroup route setup.
test/OpenTelemetry.Instrumentation.AspNetCore.Tests/MetricTests.cs	Removes #if NET guards; leaves an unused using that should be cleaned up.
test/OpenTelemetry.Instrumentation.AspNetCore.Tests/BasicTests.cs	Simplifies assertions by removing #if NET branches for ActivitySource name/version validation.
src/OpenTelemetry.Instrumentation.AspNetCore/OpenTelemetry.Instrumentation.AspNetCore.csproj	Adds AssemblyVersionExtensions.cs include to support GetPackageVersion().
src/OpenTelemetry.Instrumentation.AspNetCore/Implementation/HttpInListener.cs	Introduces CreateActivitySource() using ActivitySourceOptions with schema URL + package version.
src/OpenTelemetry.Instrumentation.AspNetCore/CHANGELOG.md	Adds changelog entry for schema URL change (currently worded more broadly than the implementation scope).
src/OpenTelemetry.Instrumentation.AspNetCore/AspNetCoreInstrumentationTracerProviderBuilderExtensions.cs	Uses HttpInListener.ActivitySource.Name when registering sources for the legacy path.

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[github-actions]

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

[Kielek]

In general, changes LGTM. Did you have chance to validate if the it really matches 1.40.0 requirements?

[martincostello]

As part of #3993 and #4337 yes - we fill in the compliance gaps for anything ASPNET.Core itself is missing.