API Changes

balancer: support injection of per-call metadata from LB policies (#5853)
resolver: remove deprecated field resolver.Target.Endpoint and replace with resolver.Target.Endpoint() (#5852)
- Special Thanks: @kylejb

New Features

xds/ringhash: introduce GRPC_RING_HASH_CAP environment variable to override the maximum ring size. (#5884)
rls: propagate headers received in RLS response to backends (#5883)

transport: drain client transport when streamID approaches MaxStreamID (#5889)
server: after GracefulStop, ensure connections are closed when final RPC completes (#5968)
server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors (#5893)
xdsclient: fix race which can happen when multiple load reporting calls are made at the same time. (#5927)
rls: fix a data race involving the LRU cache (#5925)
xds: fix panic involving double close of channel in xDS transport (#5959)
gcp/observability: update method name validation (#5951)

credentials/oauth: mark NewOauthAccess as deprecated (#5882)
- Special Thanks: @buzzsurfr