[release] Prepare release core-1.15.3

[otelbot-dotnet]

Note: This PR was opened automatically by the prepare release workflow.

Requested by: @Kielek

Changes

• CHANGELOG files updated for projects being released.
• Public API files updated for projects being released (only performed for stable releases).

Commands

/UpdateReleaseDates: Use to update release dates in CHANGELOGs before merging [approvers, maintainers]
/UpdateReleaseNotes: Use to update RELEASENOTES.md before merging [approvers, maintainers]
/CreateReleaseTag: Use after merging to push the release tag and trigger the job to create packages [approvers, maintainers]
/PushPackages: Use after the created packages have been validated to push to NuGet [maintainers]

[otelbot-dotnet]

I noticed this PR is releasing a stable version of core packages but there isn't any content in RELEASENOTES.md for the version being released.

It is important to update RELEASENOTES.md before creating the release tag because a permalink will become part of the package(s).

Post a comment with "/UpdateReleaseNotes" in the body if you would like me to update release notes.

Note: In the comment everything below "/UpdateReleaseNotes" will be added to RELEASENOTES.md for the version being released. If something is already there it will be replaced.

[Kielek]

/UpdateReleaseDates

[otelbot-dotnet]

I updated the CHANGELOG release dates.

[martincostello]

/UpdateReleaseNotes

• Breaking change: Fixed tracestate parsing to reject keys that do not
  begin with a lowercase letter, including keys beginning with digits, to
  align with the W3C Trace Context specification.
• Breaking change: Fixed an insecure disk retry default for OTLP export.
  Disk retry now requires OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH
  when OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY=disk is configured.
• Improve efficiency of parsing of baggage and B3 propagation headers.
• OtlpLogExporter now uses IHttpClientFactory on .NET 8+.
• Fixed an issue in OTLP/gRPC retry handling where parsing gRPC status.
• Fixed OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT not being applied.
• Fixed baggage and trace headers not respecting the maximum length in some cases.
• Fixed BaggagePropagator to trim optional whitespace (OWS) around =
  separators when parsing the baggage header.
• Fixed BaggagePropagator to strip baggage properties from values when
  parsing the baggage header.
• Fixed OTLP persistent storage clean-up handling for malformed filenames.
• Fixed resource leak in batch and periodic exporting task workers for Blazor/WASM.
• Fixed LogRecord.LogLevel to preserve LogLevel.None.
• Fixed OTEL_TRACES_SAMPLER_ARG handling for out-of-range values.
• Fixed an issue with OTLP disk retry storage where metrics and logs used the
  traces storage directory.
• Fixed full OTLP endpoint being logged by internal diagnostics.
• Improve efficiency of parsing of baggage, B3 and Jaeger propagation headers.
• Hardened Zipkin exporter memory usage for endpoint caching and array tag
  serialization.

[otelbot-dotnet]

I updated RELEASENOTES.md.

[otelbot-dotnet]

I noticed this PR was merged.

Post a comment with "/CreateReleaseTag" in the body if you would like me to create the release tag core-1.15.3 for the merge commit which will trigger the package workflow.

[martincostello]

/CreateReleaseTag

[otelbot-dotnet]

I just pushed the core-1.15.3 tag.

The package workflow should begin momentarily.

[otelbot-dotnet]

The packages for core-1.15.3 are now available: https://github.com/open-telemetry/opentelemetry-dotnet/actions/runs/24710605222/artifacts/6549655525.

Once these packages have been validated have a maintainer post a comment with "/PushPackages" in the body if you would like me to push to NuGet.

[martincostello]

/PushPackages

[otelbot-dotnet]

I am uploading the packages for core-1.15.3 to NuGet and then I will publish the release.

[otelbot-dotnet]

The release core-1.15.3 has been published and packages should be available on NuGet momentarily.

Have a nice day!