Release 1.12.0

API Changes

• credentials/alts: Add ServiceOption for server-side ALTS creation (#2009)

Behavior Changes

• http2Client: send reset stream when closing the stream on protocol error (#2030)

New Features

• server: export ServerTransportStreamFromContext for unary interceptors to control headers/trailers (#2019)
• metadata: Add Get, Set, and Append methods to metadata.MD (#1940)
  • Special thanks: @zkry
• server: add grpc.Method function for extracting method from context (#1961)
• grpclb: cache SubConns for 10 seconds after it is removed from the backendlist (#1957)
• clientconn: add support for unix network in DialContext (#1883)
  • Special thanks: @hexfusion
• client: introduce WithDisableServiceConfig DialOption (#2010)
• stickiness: add stickiness support (#1969)
• channelz: provide channel level info for live program network issue diagnosis/debugging
  • registration and deletion (#1811)
  • metric collection (#1909)
  • server implementation (#1919)

Performance Improvements

• transport: refactor to reduce lock contention and improve performance (#1962)

Bug Fixes

• createTransport: check for SHUTDOWN before assigning TransientFailure to ac.state (#1979)
• client: ignore "user-agent" if set in outgoing metadata (#2026)
• client: Fix race when using both client-side default CallOptions and per-call CallOptions (#1948)

Documentation

• documentation: mark compresser and decompresser as deprecated (#1971)
• documentation: add OAuth2 doc and example (#2003)
  • Special thanks: @enocom
• resolver/dns: Typo in lookupHost failure warning (#1981)
  • Special thanks: @keegancsmith
• documentation: mention peer will only be populated after RPC completes (#1982)
• documentation: add instructions for running tests locally (#2006)
• Mark old balancer and naming APIs as deprecated (#1951)
• Fix "deprecated" function godoc comments to match standard formatting (#2027)
  • Special thanks: @chyroc