gRPC-Core Release 1.63.0

[Yijie Ma]

This is 1.63.0 (giggle) release announcement for gRPC-Core and the wrapped languages C++, C#, Objective-C, Python, PHP and Ruby. Latest release notes are here.

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

Core

• [Deps] Backport: Protobuf upgrade to v26.1. (#36353)
• [OTel C++] Add experimental optional locality label available to client per-attempt metrics. (#36254)
• [surface] Add an API to inject connected endpoints into servers. (#35957)
• [CMake] Add gRPC_USE_SYSTEMD option. (#34384)
• [OTel C++] Add API to set channel scope filter. (#36189)
• [Deps] Upgraded protobuf to v26.1. (#35796)
• [channel] canonify target and set channel arg in only one place. (#36134)
• [grpc][Gpr_To_Absl_Logging] Using absl from within gpr logging. (#36108)
• [BoringSSL] Update third_party/boringssl-with-bazel. (#36089)
• [EventEngine] Document RunAfter can return an invalid handle for immediate execution. (#36072)
• [EventEngine] Enable the EventEngine DNS Resolver on Posix. (#35573)
• [EventEngine] Support AF_UNIX for windows. (#34801)

C++

• [OTel C++] Add APIs to enable/disable metrics. (#36183)
• [EventEngine] Refactor ServerCallbackCall to use EventEngine::Run. (#36126)
• [OTel C++] Add CMake build support. (#36063)
• gRPC C++ upgraded Protobuf to v26.1. (#36323)

C#

• [csharp] Fix csharp doc comments. (#36000)
• C#: Grpc.Tools: Handle regex timeout when parsing protoc output. (#36185)

PHP

• Update min PHP testing version from PHP 7.4 to 8.1. (#35964)

Python

• [Python Version] Drop support for Python 3.7. (#34450)
• [Python Aio] Change aio Metadata inheritance. (#36214)
• [Documentation] fix asyncio Server and Channel stop() method documentation. (#35946)
• [Python O11y] Change public interface. (#36094)
• [Python Stub] Add version check to stubs generated by grpcio_tools. (#35906)
• [AbortError] Reapply "[AbortError] And and check AbortError while abort". (#34525)
• [Build Reproducibility] Sort input file list. (#35687)
• [Python O11Y] Reapply registered method change. (#35850)
• [Python Modernization] Deprecate pkg_resources. (#35849)
• [Python Bazel] Allow overwriting grpc_library in python_rules.bzl. (#35629)

Ruby

• ruby: register grpc_rb_sStatus as a global variable. (#36125)