Release 1.51.0

Behavior Changes

• xds: NACK EDS resources with duplicate addresses in accordance with a recent spec change (#5715)
  • Special Thanks: @erni27
• grpc: restrict status codes that can be generated by the control plane (gRFC A54) (#5653)

New Features

• client: set grpc-accept-encoding header with all registered compressors (#5541)
  • Special Thanks: @jronak
• xds/weightedtarget: return a more meaningful error when all child policies are in TRANSIENT_FAILURE (#5711)
• gcp/observability: add "started rpcs" metric (#5768)
• xds: de-experimentalize the google-c2p-resolver (#5707)
• balancer: add experimental Producer types and methods (#5669)
• orca: provide a way for LB policies to receive OOB load reports (#5669)

Bug Fixes

• go.mod: upgrade x/text dependency to address CVE 2022-32149 (#5769)
• client: fix race that could lead to an incorrect connection state if it was closed immediately after the server's HTTP/2 preface was received (#5714)
  • Special Thanks: @fuweid
• xds: ensure sum of the weights of all EDS localities at the same priority level does not exceed uint32 max (#5703)
  • Special Thanks: @erni27
• client: fix binary logging bug which logs a server header on a trailers-only response (#5763)
• balancer/priority: fix a bug where unreleased references to removed child policies (and associated state) was causing a memory leak (#5682)
• xds/google-c2p: validate URI schema for no authorities (#5756)

Release 1.50.1

New Features

• gcp/observability: support new configuration defined in public preview user guide

Release 1.50.0

Behavior Changes

• client: use proper "@" semantics for connecting to abstract unix sockets. (#5678)
  • This is technically a bug fix; the result is that the address was including a trailing NULL byte, which it should not have. This may break users creating the socket in Go by prefixing a NULL instead of an "@", though, so calling it out as a behavior change.
  • Special Thanks: @jachor

New Features

• metadata: add experimental ValueFromIncomingContext to more efficiently retrieve a single value (#5596)
  • Special Thanks: @horpto
• stats: provide peer information in HandleConn context (#5589)
  • Special Thanks: @feihu-stripe
• xds: add support for Outlier Detection, enabled by default (#5435, #5673)

Bug Fixes

• client: fix deadlock in transport caused by GOAWAY racing with stream creation (#5652)
  • This should only occur with an HTTP/2 server that does not follow best practices of an advisory GOAWAY (not a grpc-go server).
• xds/xdsclient: fix a bug which was causing routes with cluster_specifier_plugin set to be NACKed when GRPC_EXPERIMENTAL_XDS_RLS_LB was off (#5670)
• xds/xdsclient: NACK cluster resource if config_source_specifier in lrs_server is not self (#5613)
• xds/ringhash: fix a bug which sometimes prevents the LB policy from retrying connection attempts (#5601)
• xds/ringhash: do nothing when asked to exit IDLE instead of falling back on the default channel behavior of connecting to all addresses (#5614)
• xds/rls: fix a bug which was causing the channel to be stuck in IDLE (#5656)
• alts: fix a bug which was setting WaitForReady on handshaker service RPCs, thereby delaying fallback when required (#5620)
• gcp/observability: fix End() to cleanup global state correctly (#5623)

Release 1.49.0

New Features

• gcp/observability: add support for Environment Variable GRPC_CONFIG_OBSERVABILITY_JSON (#5525)
• gcp/observability: add support for custom tags (#5565)

Behavior Changes

• server: reduce log level from Warning to Info for early connection establishment errors (#5524)
  • Special Thanks: @jpkrohling

Bug Fixes

• client: fix race in flow control that could lead to unexpected EOF errors (#5494)
• client: fix a race that could cause RPCs to time out instead of failing more quickly with UNAVAILABLE (#5503)
• client & server: fix a panic caused by passing a nil stats handler to grpc.WithStatsHandler or grpc.StatsHandler (#5543)
• transport/server: fix a race that could cause a stray header to be sent (#5513)
• balancer: give precedence to IDLE over TRANSIENT_FAILURE when aggregating connectivity state (#5473)
• xds/xdsclient: request correct resource name when user specifies a new style resource name with empty authority (#5488)
• xds/xdsclient: NACK endpoint resources with zero weight (#5560)
• xds/xdsclient: fix bug that would reset resource version information after ADS stream restart (#5422)
• xds/xdsclient: fix goroutine leaks when load reporting is enabled (#5505)
• xds/ringhash: fix config update processing to recreate ring and picker when min/max ring size changes (#5557)
• xds/ringhash: avoid recreating subChannels when update doesn't change address weight information (#5431)
• xds/priority: fix bug which could cause priority LB to block all traffic after a config update (#5549)
• xds: fix bug when environment variable GRPC_EXPERIMENTAL_ENABLE_OUTLIER_DETECTION is set to true (#5537)

Release 1.48.0

Bug Fixes

• xds/priority: fix bug that could prevent higher priorities from receiving config updates (#5417)
• RLS load balancer: don't propagate the status code returned on control plane RPCs to data plane RPCs (#5400)

New Features

• stats: add support for multiple stats handlers in a single client or server (#5347)
• gcp/observability: add experimental OpenCensus tracing/metrics support (#5372)
• xds: enable aggregate and logical DNS clusters by default (#5380)
• credentials/google (for xds): support xdstp C2P cluster names (#5399)

Release 1.47.0

New Features

• xds: add support for RBAC metadata invert matchers (#5345)

Bug Fixes

• client: fix a context leaked if a connection to an address is lost before it is fully established (#5337)
  • Special Thanks: @carzil
• client: fix potential panic during RPC retries (#5323)
• xds/client: fix a potential concurrent map read/write in load reporting (#5331)
• client/SubConn: do not recreate addrConn if UpdateAddresses is called with the same addresses (#5373)
• xds/eds: resources containing duplicate localities with the same priority will be rejected (#5303)
• server: return Canceled or DeadlineExceeded status code when writing headers to a stream that is already closed (#5292)
  • Special Thanks: @idiamond-stripe

Behavior Changes

• xds/priority: start the init timer when a child switches to Connecting from non-failure states (#5334)
• server: respond with HTTP Status 405 and gRPC status INTERNAL if the method sent to server is not POST (#5364)

Documentation

• server: clarify documentation around setting and sending headers and ServerStream errors (#5302)

Release v1.46.2

Bug Fixes

• client: fix potential panic during RPC retries (#5323)
• xds: fix leak of deleted CDS resources from CSDS view (#5339)

Release 1.46.0

New Features

• server: Support setting TCP_USER_TIMEOUT on grpc.Server connections using keepalive.ServerParameters.Time (#5219)
  • Special Thanks: @bonnefoa
• client: perform graceful switching of LB policies in the ClientConn by default (#5285)
• all: improve logging by including channelz identifier in log messages (#5192)

API Changes

• grpc: delete WithBalancerName() API, deprecated over 4 years ago in #1697 (#5232)
• balancer: change BuildOptions.ChannelzParentID to an opaque identifier instead of int (#5192)
  • Note: the balancer package is labeled as EXPERIMENTAL, and we don't believe users were using this field.

Behavior Changes

• client: change connectivity state to TransientFailure in pick_first LB policy when all addresses are removed (#5274)
  • This is a minor change that brings grpc-go's behavior in line with the intended behavior and how C and Java behave.
• metadata: add client-side validation of HTTP-invalid metadata before attempting to send (#4886)
  • Special Thanks: @Patrick0308

Bug Fixes

• metadata: make a copy of the value slices in FromContext() functions so that modifications won't be made to the original copy (#5267)
• client: handle invalid service configs by applying the default, if applicable (#5238)
• xds: the xds client will now apply a 1 second backoff before recreating ADS or LRS streams (#5280)

Dependencies

• Upgrade security/authorization module dependencies to https://github.com/google/cel-go v0.10.1 and others (#5243)
  • Special Thanks: @TristonianJones

Release 1.45.0

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)

Release 1.44.0

New Features

• balancer: add RLS load balancing policy (#5046)
• xds: add RLS Cluster Specifier Plugin (#5004)
• insecure: remove experimental notice (#5069)

Bug Fixes

• internal/balancergroup: eliminate race in exitIdle (#5012)
• authz: fix regex expression match (#5035)

Documentation

• grpc: minor improvement on WithInsecure() document (#5068)
  • Special Thanks: @shitian-ni
• attributes: document that some value types (e.g. maps) must implement Equal (#5109)
• dialoptions.go: Fix WithBlock godoc (#5073)
  • Special Thanks: @sgreene570
• grpclog.DepthLoggerV2: Correct comment: formats like fmt.Println (#5038)
  • Special Thanks: @evanj