Bug Fixes

• xds/clusterresolver: pass cluster name to DNS child policy to be used in creds handshake (#5119)
• reflection: support dynamic messages (#5180)
  • Special Thanks: @codebutler

Performance Improvements

• wrr: improve randomWRR performance (#5067)
  • Special Thanks: @huangchong94

Behavior Changes

• server: convert context errors returned by service handlers to status with the correct status code (Canceled or DeadlineExceeded), instead of Unknown (#5156)

New Features

• reflection: add NewServer(ServerOptions) for creating a reflection server with advanced customizations (#5197)
• xds: support federation (#5128)
• xds/resource: accept Self as LDS's RDS config source and CDS's EDS config source (#5152)
• xds/bootstrap: add plugin system for credentials specified in bootstrap file (#5136)