grpc: emit per-message events for streaming RPCs

[lucasmeijer]

No description provided.

[aspect-workflows]

Test

25 test targets passed

Targets

//pkg/auth:auth_test [k8-fastbuild]                                                           984ms
//pkg/blobstore/buffer:buffer_test [k8-fastbuild]                                             181ms
//pkg/blobstore/completenesschecking:completenesschecking_test [k8-fastbuild]                 113ms
//pkg/blobstore/grpcclients:grpcclients_test [k8-fastbuild]                                   139ms
//pkg/blobstore/grpcservers:grpcservers_test [k8-fastbuild]                                   138ms
//pkg/blobstore/local:local_test [k8-fastbuild]                                               255ms
//pkg/blobstore/mirrored:mirrored_test [k8-fastbuild]                                         153ms
//pkg/blobstore/readcaching:readcaching_test [k8-fastbuild]                                   68ms
//pkg/blobstore/readfallback:readfallback_test [k8-fastbuild]                                 170ms
//pkg/blobstore/replication:replication_test [k8-fastbuild]                                   139ms
//pkg/blobstore/sharding/integration:integration_test [k8-fastbuild]                          64ms
//pkg/blobstore/sharding:sharding_test [k8-fastbuild]                                         776ms
//pkg/blobstore:blobstore_test [k8-fastbuild]                                                 107ms
//pkg/builder:builder_test [k8-fastbuild]                                                     133ms
//pkg/capabilities:capabilities_test [k8-fastbuild]                                           116ms
//pkg/digest:digest_test [k8-fastbuild]                                                       134ms
//pkg/filesystem/path:path_test [k8-fastbuild]                                                146ms
//pkg/grpc:grpc_test [k8-fastbuild]                                                           144ms
//pkg/http/server:server_test [k8-fastbuild]                                                  144ms
//pkg/jmespath:jmespath_test [k8-fastbuild]                                                   441ms
//pkg/jwt:jwt_test [k8-fastbuild]                                                             229ms
//pkg/otel:otel_test [k8-fastbuild]                                                           142ms
//pkg/prometheus:prometheus_test [k8-fastbuild]                                               115ms
//pkg/util:util_test [k8-fastbuild]                                                           168ms
//pkg/x509:x509_test [k8-fastbuild]                                                           117ms

Total test execution time was 5s. 4 tests (13.8%) were fully cached saving 342ms.

[EdSchouten]

Shouldn't the word 'first' be removed here? I think the original description was accurate, with the exception of that final sentence.

[EdSchouten]

s/_message/_messages/ ?

[EdSchouten]

I'm not too happy with the term 'follow-up'. What are your thoughts on having options like these instead?

// If not set, only extract attributes from the first request message, and
// attach them to the trace span.
//
// If set, extract attributes from all request messages, and emit a per-message
// span event containing those attributes.
bool emit_request_message_events = 3;

// If not set, only extract attributes from the first response message, and [...]
bool emit_response_message_events = 4;