gRPC-Core Release 1.35.0

[Stanley Cheung]

This is the 1.35.0 (gecko) release announcement for gRPC-Core and the wrapped languages C++, C#, Objective-C, Python, PHP and Ruby. Latest release notes are here.

Core

• Backport "Fix implicit declaration error in zlib + macOS #24979". (#25133)
• xDS features doc update for case insensitive prefix/full path matching. (#24999)
• Add darwin_arm64 and darwin_arm64e to c-ares config settings. (#24872)
• Add FileWatcher CertificateProvider. (#24600)
• Protect xds security code with the environment variable "GRPC_XDS_EXPERIMENTAL_SECURITY_SUPPORT". (#24780)

C++

• Upgrade bazel to 3.7.1 (repository-wide). (#25000)
• Makefile: remove support for building protobuf, C++ libraries and executables. (#24000)

C#

• fix nuget package signing on Linux (do not use PublicSign=true on non-windows). (#24980)
• Remove C# as a supported language for xDS features. (#24982)
• Fix C# native library loading in .NET 5 single-file apps. (#24744)

Python

• Fix visibility of libprotobuf symbols in protoc_compiler.so on Mac. (#24992)
• [Aio] Correct type annotation of grpc.aio.ServicerContext.abort. (#24946)
• Add limit concurrent RPC feature to asyncio server. (#24818)
• [Aio] Fix the emtpy response handling in streaming RPC. (#24801)
• [Backport] Implement grpc.Future interface in SingleThreadedRendezvous. (#24574)
• [Backport] Make Python 2 an optional dependency for Bazel build. (#24452)

Ruby

• Fix implicit decalaration in rb_event_thread.c. (#24962)
• Base the ruby build off of latest rake-compiler-dock/manylinux14 images, add ruby 3.0 binary packages. (#25070)
• Ruby: add support to circuit_breaking xds interop test case. (#25028)
• Binary packages (for example, grpc-1.35.0-x86_64-linux.gem):
  • Are now compatible with ruby 3.0
  • Are now built off of manylinux14 (we no longer support Centos 6)