Summary

• [Tracing] Improve memory_load metric in .NET 10 • [Tracing] Reduce buffer contention when writing spans • [CI Visibility] Improve CODEOWNERS parsing • [Continuous Profiling] Bug fixes and performance improvements • [Feature Flagging] Send split serial ids on exposure events

Changes

Tracer

• Avoid unobserved tasks for synchronous delegate exceptions (#9071) • Reduce locking in AgentWriter to avoid contention (#9107) • Expose the TrailerSize of an ISpanBufferSerializer (#9115) • Fix lock-contention causing trace to be "stranded" (#9120) • Improve GcMemoryLoadCalculator by using GC.GetConfigurationVariables() where possible (#9146)

CI Visibility

• [CI Visibility] Refactor CODEOWNERS parsing and source ownership resolution (#9099) • [CI Visibility] Fix coverage rewrites with shared framework dependencies (#9102) • [CI Visibility] Keep CODEOWNERS matches inside repository (#9127) • [CI Visibility] Stabilize CODEOWNERS concurrency test (#9143) • [CI Visibility] Resolve CODEOWNERS from matching local checkout (#9148)

Continuous Profiler

• [Profiler] ManagedCodeCache updates synchronously (#8840) • [Profiler] Fix flaky tests caused by failingtimer_create (#8988) • [Profiler] Fix start/stop crash at shutdown (#9037) • [Profiler] Fix crashes at shutdown (#9050) • [Profiler] Measure and reduce GC profiling impact (#9119) • [Profiler] Fix flacky tests (#9126) • [Profiler] Fix bug in FrameStore (#9140)

Feature Flags and Experimentation

• [Feature Flags] Send the split serial id on exposure events (#9088) • feat(feature-flags)：add agentless configuration keys, settings, and endpoint derivation (#9040) • feat(feature-flags)：add UFC parser and agentless HTTP poller (#9042) • feat(openfeature)：support arbitrary semver parts (#9122)

Build / Test

• Migrate remaining integration tests to CombinatorialOrPairwiseData (#8528) • Move secrets to be protected environment secrets (#8865) • Try to make it so that CODEOWNERs triggers tests (#9092) • Split system-test docker image creation to work in both protected and unprotected environments (#9094) • [Test Package Versions Bump] Updating package versions (#9100) • Consolidate and fix bugs in GitLab "download from Azure" scripts (#9103) • Don't need to download and sign when pushing a tag (#9105) • Mark DSM TransportsWorkCorrectly as flaky (#9116) • Mark DSM ContextPropagation as flaky (#9117) • [Test Package Versions Bump] Updating package versions (#9124) • Bump test logger to latest (to try to fix codeowners) (#9128) • Add new Random() to the banned API list, to discourage using those APIs (#9129) • Add SDK capabilities and LP as owners in addition to tracing-dotnet (#9130) • Bump SLO for throughput tests (#9131) • [Smoke Test Docker Image Bump] Updating docker image tags (#9134) • Add many timeouts and retries to build stages in Azure DevOps (#9141) • Move CI uploads to new subscription (#9142) • Refine listed non-IDM tests to single owner (#9149) • [CI Visibility] Bump Datadog test packages to 0.0.59 (#9151) • [Test Package Versions Bump] Updating package versions (#9152) • [Smoke Test Docker Image Bump] Updating docker image tags (#9153) • Increase profiler integration test timeout (#9158) • Bump the gh-actions-packages group across 2 directories with 4 updates (#9161) • [Test Package Versions Bump] Updating package versions (#9163) • Don't run high-concurrency tests in parallel with other tests (#9166) • Fix release creation (#9190) • Fix broken unit tests in GcMemoryLoadCalculatorTests (#9101)

Miscellaneous

• [Propagators] Add OpenTelemetry consistent probability sampling (#8983) • Revert "[Propagators] Add OpenTelemetry consistent probability sampling" (#9171) • feat(otel)：Emit OpenTelemetry HTTP semantic conventions on HTTP server spans (ASP.NET Core) (#8995) • [Propagators] Generalize tracestate parsing (#9000) • Remove exception throwing from CanCreate() paths in DuckTyping (#9005) • Revert "[Propagators] Add OpenTelemetry consistent probability sampling" (#9171)

Changes since 3.52.0