Summary

• [Continuous Profiler] Add experimental support for Linux ARM64
• [AAP] Fix body analysis on downstream requests causing stream-closed issues
• [Serverless] Add support for running multiple Azure Functions in the same Windows hosting plan
• [Data Streams Monitoring] Add produce-side checkpoints for Azure Service Bus
• [FFE] Update minimum required version of OpenFeature for Datadog.FeatureFlags.OpenFeature
• [Dynamic Instrumentation] Many fixes and performance improvements

Changes

Tracer

• Fix metrics for baggage extract (#8561)
• Skip sending errors to instrumentation telemetry for performance counter initialization (#8598)
• Add handling of OutOfMemoryException to runtime metrics polyfill (#8609)
• Switch Activity handling to use WeakReference<T> (#8549)
• Add a fixed cutoff for the activity handler reconcilliation loop for OTel (#8576)

CI Visibility

• Add Jenkins custom parent ID bypass (#8608)

ASM

• Fix IAST strings deferred enumerable (#8556)
• [AAP] Trace tagging rules (#8581)

Continuous Profiler

• [Profiler] Add support for ARM64 (#8338)
• [Profiler] Ensure valid json format for information json (#8578)
• [Profiler] Add guard-rails when creating a profile (#8579)

Debugger

• [SymDB] Defer SymDB startup work (#8548)
• Reapply "[SymDB] DEBUG-5086 SymDB upload enable when DI is disabled" (#8565)
• [Dynamic Instrumentation] Skip arg/local when byref-like check fails (#8566)
• [Debugger] Harden SnapshotPruner fallback handling (#8567)
• [Debugger] Treat Nullable as safe for snapshot ToString (#8568)
• [Debugger] Handle open generic types in probe expressions (#8569)
• [Debugger] Reuse singleton no-op symbol uploader (#8570)
• [Debugger Tests] Surface sample exit diagnostics during /stop cleanup (#8571)
• [Debugger] Fix flaky DI probe file test (#8575)
• [Debugger] Fix ConcurrentAdaptiveCache.GetOrAdd race that returned stale value (#8584)
• Remove allocation and delay in startup due to JSON parsing in Symbol uploader (#8589)
• Debugger: add upload metadata fields to SymDB upload event message (#8590)
• [Debugger] Reduce noisy Info logs to debug in native code (#8618)
• [Debugger] Fix Timer leaks and missing rate updates in probe rate limiter (#8619)
• [Debugger] DEBUG-4260 Add capture expression to log probe (#8621)
• fix(debugger): redact nullable wrappers of configured types (#8642)
• [Dynamic Instrumentation] Fix Equals/GetHashCode contract on Dynamic Instrumentation configuration models (#8615)
• [Code Origin] Reduce endpoint detector allocations (#8588)
• [Code Origin] Improve ASP.NET Core code origin endpoint detection (#8595)
• [Code Origin] Optimize per-assembly PDB cache (#8631)
• [Code Origin] Treat Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore as 3rd party (#8628)
• [Code Origin] Skip exit-span hook in Tracer.StartSpan (#8635)

Serverless

• Add Multi-Azure Function Unique Named Pipe Configuration (#8164)
• [Azure Functions] Update Datadog.Serverless.Compat version to 1.4.0 (#8563)
• [Serverless] Bump Datadog.Serverless.Compat to 1.5.0 (#8602)

Miscellaneous

• [Feature Flags] Add flag evaluation metrics via OpenFeature hook (#8367)
• [Runtime Metrics] Support for OTLP Runtime Metrics (#8457)

Data Streams Monitoring

• [DSM] Fix missing produce-side checkpoints for Azure Service Bus (#8433)

Build / Test

• Improve agents.md (#8554)
• Fix azure-functions skill YAML frontmatter parsing (#8583)
• AGENTS.md cleanup, round 2 (#8596)
• [SINT-5051] Update CI identities client version and Windows code signer to latest release (#8474)
• Allow building the Gitlab docker image in Gitlab (#8507)
• Ensure we always run all smoke tests on Docker tag bump PRs (#8514)
• Reduce warnings in test-applications samples (#8519)
• Add smoke tests for Ubuntu 26.04 (Resolute Racoon) (#8522)
• Decrease warnings part 3 (#8546)
• [SERVERLESS CI] use serverless-tools tags (#8551)
• Bump the gh-actions-packages group across 1 directory with 2 updates (#8552)
• [Test Package Versions Bump] Updating package versions (#8553)
• Retry microbenchmarks on non-compliant CPUs (#8558)
• Enable OpenTelemetry microbenchmarks (#8559)
• Don't run benchmark trigger on tag pushes (#8560)
• [Test Package Versions Bump] Updating package versions (#8564)
• [Libdatadog] Bump libdatadog + add SKILL.md to do it (#8580)
• [Test Package Versions Bump] Updating package versions (#8593)
• [Smoke Test Docker Image Bump] Updating docker image tags (#8594)
• [ASM Test] Add IIS CI coverage for WebApi null-action ASM test (#8597)
• Decrease warnings part 4 (#8599)
• chore(ci) update one-pipeline (#8600)
• Exclude OpenTelemetry.Api from benchmark PR comments (#8606)
• Use latest benchmark tooling image for macrobenchmark AMI build (#8625)
• [SINT-5051] Upgrade CI Identities GitLab Job Client version to v0.6.3 (#8627)
• [ASM Test] Mark WebApi null-action test as end-to-end (#8604)

Changes since 3.43.0