Release 1.72.0

Dependencies

• Minimum supported Go version is now 1.23 (#8108)

API Changes

• resolver: add experimental AddressMapV2 with generics to ultimately replace AddressMap. Deprecate AddressMap for deletion (#8187)
• resolver: convert EndpointMap in place to use generics (#8189)

New Features

• xds: add grpc.xds_client.server_failure counter metric on xDS client to record connectivity errors (#8203)
• balancer/rls: allow maxAge to exceed 5 minutes if staleAge is set in the LB policy configuration (#8137)
• ringhash: implement gRFC A76 improvements. (#8159)
• pickfirst: The new pick first LB policy is made the default. The new LB policy implements the Happy Eyeballs algorithm. To disable the new policy set the environment variable GRPC_EXPERIMENTAL_ENABLE_NEW_PICK_FIRST to false (case insensitive).

Bug Fixes

• xds: fix support for circuit breakers and load reporting in LOGICAL_DNS clusters (#8169, #8170)
• xds/cds: improve RPC error messages when resources are not found (#8122)
• balancer/priority: fix race that could leak balancers and goroutines during shutdown (#8095)
• stats/opentelemetry: fix trace attributes message sequence numbers to start from 0 (#8237)
• balancer/pickfirstleaf: fix panic if deprecated Address.Metadata field is set to a non-comparable value by ignoring the field (#8227)

Behavior Changes

• transport: make servers send an HTTP/2 RST_STREAM frame to cancel a stream when the deadline expires (#8071)

Documentation

• stats: clarify the expected sequence of events on a stats handler (#7885)
  • Special Thanks: @RyanBlaney