gRPC - v1.61.0

This is release 1.61.0 (grand) of gRPC Core.

For gRPC documentation, see grpc.io. For previous releases, see Releases.

This release contains refinements, improvements, and bug fixes, with highlights listed below.

Core

• [xDS] fix aggregate cluster design. (#35313)
• [SSA] change xds_override_host policy to manage subchannels based on last-used time rather than EDS health state. (#35397)
• [xDS] read connection idle timeout from CDS resource. (#35395)
• [xDS] move CDS and EDS watchers into xds resolver. (#35011)
• [alpn] Remove grpc-exp experimental ALPN protocol. (#34876)
• Updated zlib to 1.3. (#35147)
• [EventEngine] Clarify API: callback cancellation and thread safety. (#35009)

C++

• [OTel] De-experimentalize API. (#35509)
• [OTel] Experimental API for metrics. (#35348)
• [OTel] Update OTel Bazel dep to v1.13.0. (#35352)
• [example] C++ Debugging. (#35222)
• [otel] Update OTel to head. (#35151)

Python

• [Python O11Y] Add _registered_method to init.py. (#35482)
• [Python Otel] Re-apply Otel. (#35439)
• [python O11Y] Implement OpenTelemetry. (#35292)

Ruby

• [ruby] backport "Build/test ruby 3.3 and build native gems with Ruby 3.3 support (#35399)". (#35614)