Emit cutover metrics#45
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Use a single metrics emitter abstraction for gauge, count, and histogram samples so metric helpers share one testable client contract.
Keep the small metric emission helpers, runtime reporter, and their tests together so the metrics package has fewer one-function files.
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Add cutover metric helpers and instrument cutover attempts, phase durations, and terminal duration. Metrics emitted: - cut_over.attempts_total tagged with outcome - cut_over.phase_duration_milliseconds tagged with phase and outcome - cut_over.total_duration_milliseconds tagged with outcome Phase coverage includes the magic lock, original table lock, magic rename, and unlock paths. Durations are reported in milliseconds to preserve sub-second granularity. Add unit coverage for the cutover metric helper.
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Closes https://github.com/Shopify/schema-migrations/issues/5457
Add cutover metric helpers and instrument cutover attempts, phase
durations, and terminal duration.
Metrics emitted:
Phase coverage includes the magic lock, original table lock, magic rename,
and unlock paths. Durations are reported in milliseconds to preserve
sub-second granularity.
Add unit coverage for the cutover metric helper.
🎩
Cherry-picked this commit plus a few others onto a separate branch, ran a
dev tophat runto addnametofake_data:script/cibuildreturns with no formatting errors, build errors or unit test errors.