API Changes

• resolver: remove deprecated Target.Scheme and Target.Authority. Use URL.Scheme and URL.Host instead, respectively (#6363)

Behavior Changes

• client: percent-encode the default authority for the channel (#6428)
• xds: require EDS service name to be set in a CDS cluster with an 'xdstp' resource name (gRFC A47) (#6438)

New Features

• reflection: support the v1 reflection service and update Register to register both v1alpha and v1 (#6329)
• xds: add support for string matcher in RBAC header matching (#6419)
• alts: add support for GRPC_ALTS_MAX_CONCURRENT_HANDSHAKES env var (#6267)
• balancer/weightedroundrobin: de-experimentalize name of LB policy (#6477)

Bug Fixes

• status: status.FromError now returns an error with codes.Unknown when the error implements the GRPCStatus() method, and calling GRPCStatus() returns nil (#6374)
  • Special Thanks: @atollena
• server: fix bug preventing TCP user timeout from being set on the connection when TLS is used (#6321)
  • Special Thanks: @tobotg
• client: eliminate connection churn during an address update that differs only in balancer attributes (#6439)
• clusterresolver: handle EDS nacks, resource-not-found errors, and DNS Resolver errors correctly (#6436, #6461)
• xds/ringhash: cache connectivity state of subchannels inside picker to avoid rare races (#6351)