Behavior Changes

• xds: remove support for xDS v2 transport API (#6013)

New Features

• server: expose SetSendCompressor API to set send compressor name (#5744)
  • Special Thanks: @jronak
• xdsclient: include Node proto only in the first discovery request message, to improve performance (#6078)

Bug Fixes

• metadata: fix validation logic and properly validate metadata appended via AppendToOutgoingContext (#6001)
  • Special Thanks: @ktalg
• transport: do not close connections when we encounter I/O errors until after all data is consumed (#6110)
• ringhash: ensure addresses are consistently hashed across updates (#6066)
• xds/clusterimpl: fix a bug causing unnecessary closing and re-opening of LRS streams (#6112)
• xds: NACK route configuration if sum of weights of weighted clusters exceeds uint32_max (#6085)

Documentation

• resolver: update Resolver.Scheme() docstring to mention requirement of lowercase scheme names (#6014)
• resolver: document expected error handling of UpdateState errors (#6002)
  • Special Thanks: @fho
• examples: add example for ORCA load reporting (#6114)
• examples: add an example to illustrate authorization (authz) support (#5920)
  • Special Thanks: @KenxinKun