Botond Dénes 035aa90d4b Merge 'Alternator: add per-table batch latency metrics and test coverage' from Amnon Heiman ...

This series fixes a metrics visibility gap in Alternator and adds regression coverage.

Until now, BatchGetItem and BatchWriteItem updated global latency histograms but did not consistently update per-table latency histograms. As a result, table-level latency dashboards could miss batch traffic.

It updates the batch read/write paths to compute request duration once and record it in both global and per-table latency metrics.

Add the missing tests, including a metric-agnostic helper and a dedicated per-table latency test that verifies latency counters increase for item and batch operations.

This change is metrics-only (no API/behavior change for requests) and improves observability consistency between global and per-table views.

Fixes #28721

**We assume the alternator per-table metrics exist, but the batch ones are not updated**

Closes scylladb/scylladb#28732

* github.com:scylladb/scylladb:
  test(alternator): add per-table latency coverage for item and batch ops
  alternator: track per-table latency for batch get/write operations

2026-03-16 17:18:00 +02:00

324 KiB

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