rahul2393

feat(spanner): penalize channels that returned Unavailable or ResourceExhausted in the dynamic channel pool picker (#20390) Fixes: b/546194028

feat(spanner): support caller-owned OpenTelemetry client metrics (#20388) Internal Reference: go/built-in-metric-custom-export Java PR: https://github.com/googleapis/google-cloud-java/pull/13741

fix(spanner): roll back read-write transaction before retrying caller-returned Aborted errors (#20131) Fixes: b/519914289 Returning a fabricated `codes.Aborted` error from a `ReadWriteTransaction` body (one the server never sent) makes the client retry the function without rolling back the current attempt. The server-side transaction stays alive holding its locks, so the retry immediately queues behind the previous attempt's own locks and stalls until the session or transaction times out. The fix tracks on the transaction whether an abort was actually observed from the server. When the retry loop sees an Aborted error that did not come from the server, it rolls the transaction back before starting the next attempt. Genuine server aborts behave exactly as before, including passing the previous transaction id on the retry so wound-wait priority is preserved. If that rollback itself fails, the error is surfaced as a non-retryable `FailedPrecondition` rather than retrying against a transaction in an unknown state. Concurrent readers waiting on an inline-streaming begin are also woken when the transaction aborts instead of blocking. Tests: mocked-server tests assert a `RollbackRequest` is sent between attempts for the fabricated-abort case and that none is sent for genuine server aborts, plus regression tests for explicit-begin transactions and a concurrent streaming-abort race. `go test ./...` in `spanner/` is green, including with `-race`.

fix(spanner): stop leaking endpointLatencyRegistry cleanup goroutine (#20416) Replace timer-driven cleanup with amortized inline sweeps guarded by an atomic timestamp. Importing spanner and closing clients now leave no endpoint latency registry cleanup goroutine behind. Fixes #14488

fix(spanner): update dynamic channel pool default configuration (#20080) Set DCP defaults to DCPMaxRPCPerChannel=25, DCPMinRPCPerChannel=15, DCPScaleDownCheckInterval=3m, DCPInitialChannels=4, DCPMaxChannels=10, DCPMinChannels=2. Internal Ref: go/dynamic-channel-pooling-non-sab

chore(spanner): keep handwritten omni_client files in librarian.yaml (#20036) Fixes: https://github.com/googleapis/google-cloud-go/issues/20030

chore: librarian release pull request: 20260615T093125Z (#19973) PR created by the Librarian CLI to initialize a release. Merging this PR will auto trigger a release. Librarian Version: v0.20.0 Language Image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/librarian-go@sha256:b7e38e80d677dc6b7266896bb99a33fa62348d3e39d7b8f2f6423e7dc4b35a60 <details><summary>spanner: v1.92.0</summary> ## [v1.92.0](https://github.com/googleapis/google-cloud-go/compare/spanner/v1.91.0...spanner/v1.92.0) (2026-06-15) ### Features * update API sources and regenerate (#14537) ([07fe29ba](https://github.com/googleapis/google-cloud-go/commit/07fe29ba)) * add dynamic channel pool (#14611) ([51a53cee](https://github.com/googleapis/google-cloud-go/commit/51a53cee)) * add OpenTelemetry metrics for dynamic channel pool (#14613) ([b54b4f02](https://github.com/googleapis/google-cloud-go/commit/b54b4f02)) * add option for auto-tagging transactions (#14646) ([be0afd99](https://github.com/googleapis/google-cloud-go/commit/be0afd99)) * Enable EEF for cloud spanner when direct access is enabled (#14414) ([d7c4e0fd](https://github.com/googleapis/google-cloud-go/commit/d7c4e0fd)) ### Bug Fixes * propagate previous transaction ID on inline-begin retries (#19955) ([827f70e6](https://github.com/googleapis/google-cloud-go/commit/827f70e6)) * handle unused variables (#13088) ([b2951564](https://github.com/googleapis/google-cloud-go/commit/b2951564)) * Support UUID as a base data type (#14117) ([f8b9a93a](https://github.com/googleapis/google-cloud-go/commit/f8b9a93a)) </details>