• server: Fix a regression preventing streams from being cancelled or timed out when blocked on flow control. (https://github.com/grpc/grpc-go/pull/8528)

• server: Fix a regression preventing streams from being cancelled or timed out when blocked on flow control. (https://github.com/grpc/grpc-go/pull/8528)

• xds: Fix a regression preventing empty node IDs in the bootstrap configuration. (#8476 , #8483)
• xdsclient: Fix a data race caused while reporting load to LRS. (#8483)
• server: Fix a regression preventing streams from being cancelled or timed out when blocked on flow control. (#8528)

• transport: Fix a data race while copying headers for stats handlers in the std lib http2 server transport. (#8519)
• xdsclient:
  • Fix a data race caused while reporting load to LRS. (#8483)
  • Fix regression preventing empty node IDs when creating an LRS client. (#8483)
• server: Fix a regression preventing streams from being cancelled or timed out when blocked on flow control. (#8528)

• xds: Remove support for GRPC_EXPERIMENTAL_XDS_FALLBACK environment variable. Fallback support can no longer be disabled. (#8482)
• stats: Introduce DelayedPickComplete event, a type alias of PickerUpdated. (#8465)
  • This (combined) event will now be emitted only once per call, when a transport is successfully selected for the attempt.
  • OpenTelemetry metrics will no longer have multiple "Delayed LB pick complete" events in Go, matching other gRPC languages.
  • A future release will delete the PickerUpdated symbol.
• credentials: Properly apply grpc.WithAuthority as the highest-priority option for setting authority, above the setting in the credentials themselves. (#8488)
  • Now that this WithAuthority is available, the credentials should not be used to override the authority.
• round_robin: Randomize the order in which addresses are connected to in order to spread out initial RPC load between clients. (#8438)
• server: Return status code INTERNAL when a client sends more than one request in unary and server streaming RPC. (#8385)
  • This is a behavior change but also a bug fix to bring gRPC-Go in line with the gRPC spec.

• dns: Add an environment variable (GRPC_ENABLE_TXT_SERVICE_CONFIG) to provide a way to disable TXT lookups in the DNS resolver (by setting it to false). By default, TXT lookups are enabled, as they were previously. (#8377)

• xds: Fix regression preventing empty node IDs in xDS bootstrap configuration. (#8476)
  • Special Thanks: @davinci26
• xds: Fix possible panic when certain invalid resources are encountered. (#8412)
  • Special Thanks: @wooffie
• xdsclient: Fix a rare panic caused by processing a response from a closed server. (#8389)
• stats: Fix metric unit formatting by enclosing non-standard units like call and endpoint in curly braces to comply with UCUM and gRPC OpenTelemetry guidelines. (#8481)
• xds: Fix possible panic when clusters are removed from the xds configuration. (#8428)
• xdsclient: Fix a race causing "resource doesn not exist" when rapidly subscribing and unsubscribing to the same resource. (#8369)
• client: When determining the authority, properly percent-encode (if needed, which is unlikely) when the target string omits the hostname and only specifies a port (grpc.NewClient(":<port-number-or-name>")). (#8488)

• balancer: add ExitIdle method to Balancer interface. Earlier, implementing this method was optional. (#8367)

• xds: Remove the GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST environment variable that allows disabling the least request balancer with xDS. Least request was made available by default with xDS in v1.72.0. (#8248)
  • Special Thanks: @atollena
• server: allow 0s grpc-timeout header values, which older gRPC-Java versions could send. This restores the behavior of grpc-go before v1.73.0. (#8439)

• googledirectpath: avoid logging the error message Attempt to set a bootstrap configuration... when creating multiple directpath channels. (#8419)

• transport: reduce heap allocations by pooling objects and avoiding method-to-closure conversions. (#8361)
• transport: reduce heap allocations by re-using mem.Reader objects. (#8360)

• examples: add examples to demonstrate enabling experimental metrics using the OpenTelemetry plugin. (#8388)
  • Special Thanks: @vinothkumarr227

Version 1.74.1 retracts release v1.74.0 and itself. Release 1.74.0 was accidentally tagged on the wrong commit and should not be used. Version 1.73.0 should be used until 1.74.2 is released.

Release 1.74.0 was accidentally tagged on the wrong commit and will be deleted. Please update to 1.74.1 which should be released shortly.

• balancer/ringhash: move LB policy from xds/internal to exported path to facilitate use without xds (#8249)
• xds: enable least request LB policy by default. It can be disabled by setting GRPC_EXPERIMENTAL_ENABLE_LEAST_REQUEST=false in your environment. (#8253)
• grpc: add a CallAuthority Call Option that can be used to overwrite the http :authority header on per-RPC basis. (#8068)
• stats/opentelemetry: add trace event for name resolution delay. (#8074)
• health: added List method to gRPC Health service. (#8155)
  • Special Thanks: @marcoshuck
• ringhash: implement features from gRFC A76. (#8159)
• xds: add functionality to support SPIFFE Bundle Maps as roots of trust in XDS which can be enabled by setting GRPC_EXPERIMENTAL_XDS_MTLS_SPIFFE=true. (#8167, #8180, #8229, #8343)

• xds: locality ID metric label is changed to make it consistent with gRFC A78. (#8256)
• client: fail RPCs on the client when using extremely short contexts that expire before the grpc-timeout header is created. (#8312)
• server: non-positive grpc-timeout header values are now rejected. This is consistent with the gRPC protocol spec. (#8290)
  • Special Thanks: @evanj
• xds: fix reported error string when LRS load reporting interval is invalid. (#8224)
  • Special Thanks: @alingse

• credentials/alts: improve read performance by optimizing buffer copies and allocations. (#8271)
• server: improve performance of RPC handling by avoid a status proto copy (#8282)
  • Special Thanks: @evanj

• examples/features/opentelemetry: modify example to demonstrate tracing using OpenTelemtry plugin. (#8056)

• client: restore support for NO_PROXY environment variable when connecting to locally-resolved addresses (case 2 from gRFC A1). (#8329)
• balancer/least_request: fix panic on resolver errors. (#8333)