#490)

This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | Type | Update |
|---|---|---|---|---|---|
| [github.com/googleapis/gax-go/v2](https://redirect.github.com/googleapis/gax-go) | `v2.18.0` → `v2.19.0` | ![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgoogleapis%2fgax-go%2fv2/v2.19.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgoogleapis%2fgax-go%2fv2/v2.18.0/v2.19.0?slim=true) | require | minor |
| [google.golang.org/genproto](https://redirect.github.com/googleapis/go-genproto) | `0b37fe3` → `d00831a` | ![age](https://developer.mend.io/api/mc/badges/age/go/google.golang.org%2fgenproto/v0.0.0-20260319201613-d00831a3d3e7?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/google.golang.org%2fgenproto/v0.0.0-20260316180232-0b37fe3546d5/v0.0.0-20260319201613-d00831a3d3e7?slim=true) | require | digest |
| [google.golang.org/genproto/googleapis/api](https://redirect.github.com/googleapis/go-genproto) | `0b37fe3` → `d00831a` | ![age](https://developer.mend.io/api/mc/badges/age/go/google.golang.org%2fgenproto%2fgoogleapis%2fapi/v0.0.0-20260319201613-d00831a3d3e7?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/google.golang.org%2fgenproto%2fgoogleapis%2fapi/v0.0.0-20260316180232-0b37fe3546d5/v0.0.0-20260319201613-d00831a3d3e7?slim=true) | require | digest |
| [google.golang.org/genproto/googleapis/rpc](https://redirect.github.com/googleapis/go-genproto) | `0b37fe3` → `d00831a` | ![age](https://developer.mend.io/api/mc/badges/age/go/google.golang.org%2fgenproto%2fgoogleapis%2frpc/v0.0.0-20260319201613-d00831a3d3e7?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/go/google.golang.org%2fgenproto%2fgoogleapis%2frpc/v0.0.0-20260316180232-0b37fe3546d5/v0.0.0-20260319201613-d00831a3d3e7?slim=true) | require | digest |

---

### Release Notes

<details>
<summary>googleapis/gax-go (github.com/googleapis/gax-go/v2)</summary>

### [`v2.19.0`](https://redirect.github.com/googleapis/gax-go/releases/tag/v2.19.0): v2: v2.19.0

[Compare Source](https://redirect.github.com/googleapis/gax-go/compare/v2.18.0...v2.19.0)

##### Features

- update WithLogger to WithLoggerContext. ([#&#8203;478](https://redirect.github.com/googleapis/gax-go/issues/478)) ([1cb70ba](https://redirect.github.com/googleapis/gax-go/commit/1cb70baf))

- pass logger to downstream via context ([#&#8203;474](https://redirect.github.com/googleapis/gax-go/issues/474)) ([434fa67](https://redirect.github.com/googleapis/gax-go/commit/434fa676))

- add WithClientMetrics CallOption ([#&#8203;479](https://redirect.github.com/googleapis/gax-go/issues/479)) ([76f0284](https://redirect.github.com/googleapis/gax-go/commit/76f0284e))

- add TransportTelemetryData for dynamic transport attributes ([#&#8203;481](https://redirect.github.com/googleapis/gax-go/issues/481)) ([8a7caf0](https://redirect.github.com/googleapis/gax-go/commit/8a7caf00))

- add ClientMetrics initialization core ([#&#8203;473](https://redirect.github.com/googleapis/gax-go/issues/473)) ([f53618c](https://redirect.github.com/googleapis/gax-go/commit/f53618c2))

##### Bug Fixes

- lazy initialization and getters for ClientMetrics ([#&#8203;485](https://redirect.github.com/googleapis/gax-go/issues/485)) ([fb6c5f4](https://redirect.github.com/googleapis/gax-go/commit/fb6c5f4d))

</details>

---

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Add TelemetryErrorInfo` and ExtractTelemetryErrorInfo to parse error details for metrics and actionable logs:

* Evaluate both gRPC statuses and parseable REST HTTP errors (yielding fine-grained Reasons or numeric HTTP fallbacks).
* Explicitly document fallbacks for %T unknown error types to align with OpenTelemetry registries.
* Add a Message method to apierror.APIError to retrieve raw unformatted error messages.
* Add recordMetric to measure API call durations using OpenTelemetry, capturing both static client configurations and dynamic run-time tags like rpc.method and url.template. It automatically decouples context cancellations to ensure fail-state latencies are recorded.