Release 1.58.1

Bug Fixes

• grpc: fix a bug that was decrementing active RPC count too early for streaming RPCs; leading to channel moving to IDLE even though it had open streams
• grpc: fix a bug where transports were not being closed upon channel entering IDLE

Release 1.58.0

API Changes

See #6472 for details about these changes.

• balancer: add StateListener to NewSubConnOptions for SubConn state updates and deprecate Balancer.UpdateSubConnState (#6481)
  • UpdateSubConnState will be deleted in the future.
• balancer: add SubConn.Shutdown and deprecate Balancer.RemoveSubConn (#6493)
  • RemoveSubConn will be deleted in the future.
• resolver: remove deprecated AddressType (#6451)
  • This was previously used as a signal to enable the "grpclb" load balancing policy, and to pass LB addresses to the policy. Instead, balancer/grpclb/state.Set() should be used to add these addresses to the name resolver's output. The built-in "dns" name resolver already does this.
• resolver: add new field Endpoints to State and deprecate Addresses (#6471)
  • Addresses will be deleted in the future.

New Features

• balancer/leastrequest: Add experimental support for least request LB policy and least request configured as a custom xDS policy (#6510, #6517)
  • Set GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST=true to enable
• stats: Add an RPC event for blocking caused by the LB policy's picker (#6422)

Bug Fixes

• clusterresolver: fix deadlock when dns resolver responds inline with update or error at build time (#6563)
• grpc: fix a bug where the channel could erroneously report TRANSIENT_FAILURE when actually moving to IDLE (#6497)
• balancergroup: do not cache closed sub-balancers by default; affects rls, weightedtarget and clustermanager LB policies (#6523)
• client: fix a bug that prevented detection of RPC status in trailers-only RPC responses when using ClientStream.Header(), and prevented retry of the RPC (#6557)

Performance Improvements

• client & server: Add experimental [With]SharedWriteBuffer to improve performance by reducing allocations when sending RPC messages. (Disabled by default.) (#6309)
  • Special Thanks: @s-matyukevich

Release 1.57.0

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)

Release 1.56.2

• status: To fix a panic, status.FromError now returns an error with codes.Unknown when the error implements the GRPCStatus() method, and calling GRPCStatus() returns nil. (#6374)

Release 1.55.1

• status: To fix a panic, status.FromError now returns an error with codes.Unknown when the error implements the GRPCStatus() method, and calling GRPCStatus() returns nil. (#6374)

Release 1.56.1

• client: handle empty address lists correctly in addrConn.updateAddrs

Release 1.56.0

New Features

• client: support channel idleness using WithIdleTimeout dial option (#6263)
  • This feature is currently disabled by default, but will be enabled with a 30 minute default in the future.
• client: when using pickfirst, keep channel state in TRANSIENT_FAILURE until it becomes READY (gRFC A62) (#6306)
• xds: Add support for Custom LB Policies (gRFC A52) (#6224)
• xds: support pick_first Custom LB policy (gRFC A62) (#6314) (#6317)
• client: add support for pickfirst address shuffling (gRFC A62) (#6311)
• xds: Add support for String Matcher Header Matcher in RDS (#6313)
• xds/outlierdetection: Add Channelz Logger to Outlier Detection LB (#6145)
  • Special Thanks: @s-matyukevich
• xds: enable RLS in xDS by default (#6343)
• orca: add support for application_utilization field and missing range checks on several metrics setters
• balancer/weightedroundrobin: add new LB policy for balancing between backends based on their load reports (gRFC A58) (#6241)
• authz: add conversion of json to RBAC Audit Logging config (#6192)
• authz: add support for stdout logger (#6230 and #6298)
• authz: support customizable audit functionality for authorization policy (#6192 #6230 #6298 #6158 #6304 and #6225)

Bug Fixes

• orca: fix a race at startup of out-of-band metric subscriptions that would cause the report interval to request 0 (#6245)
• xds/xdsresource: Fix Outlier Detection Config Handling and correctly set xDS Defaults (#6361)
• xds/outlierdetection: Fix Outlier Detection Config Handling by setting defaults in ParseConfig() (#6361)

API Changes

• orca: allow a ServerMetricsProvider to be passed to the ORCA service and ServerOption (#6223)

Release 1.54.1

Bug Fixes

• credentials/alts: revert a change that causes a crash in the handshaker

Release 1.55.0

Behavior Changes

• xds: enable federation support by default (#6151)
• status: status.Code and status.FromError handle wrapped errors (#6031 and #6150)
  • Special Thanks: @psyhatter

New Features

• xds/xdsclient: support ignore_resource_deletion server feature as per gRFC A53 (#6035)
• security/advancedtls: add min/max TLS version selection options (#6007)
  • Special Thanks: @joeljeske

Bug Fixes

• xds: stop routing RPCs to deleted clusters (#6125)
• client: fix race between stream creation and GOAWAY receipt, which could lead to spurious UNAVAILABLE stream errors (#6142)

Performance Improvements

• server: improve stream handler goroutine worker allocation when NumStreamWorkers is used (#6004)
  • Special Thanks: @SaveTheRbtz

GCP Observability v1.0.0

The observability module provides GCP users with a simple way to export RPC logging, tracing, and metrics to Google Cloud Operations. This is the first (GA) release of this module. For more information, please see this blog post.