* feat(observability): record unary read RPC durations
Record complete server-side durations for ReadMultiple and BatchReadVersion, including error and cancellation paths.\n\nCo-Authored-By: heihutu <heihutu@gmail.com>\nCo-Authored-By: zhi22915 <qiuzgang@gmail.com>
* test(observability): cover unary duration handlers
Exercise ReadMultiple and BatchReadVersion missing-disk paths and assert operation duration histograms.\n\nCo-Authored-By: heihutu <heihutu@gmail.com>\nCo-Authored-By: zhi22915 <qiuzgang@gmail.com>
* fix(observability): cache unary read RPC duration handles
Reuse cached duration histograms for ReadMultiple and BatchReadVersion once
the stable server label is available. Preserve the existing ReadVersion
handle and the fallback for other operations and backends.
Add an integration regression for handle reuse, startup fallback, labels,
and recorded values using the production cache path.
Co-Authored-By: heihutu <heihutu@gmail.com>
Co-Authored-By: zhi22915 <qiuzgang@gmail.com>
* fix(observability): separate server duration from client RTT
Record unary ReadMultiple and BatchReadVersion handler lifetimes in a
separate server duration histogram while preserving existing client RTT
series and allocation-free cached handles for both measurements.
Cover client/server sample separation, cache reuse, startup and backend
fallbacks, and missing-disk handlers. Document the new server metric.
Co-Authored-By: heihutu <heihutu@gmail.com>
Co-Authored-By: zhi22915 <qiuzgang@gmail.com>
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Co-authored-by: heihutu <heihutu@gmail.com>
Co-authored-by: zhi22915 <qiuzgang@gmail.com>
Co-authored-by: Chris An <anzhengchao@gmail.com>
Hauser Zhi
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