feat: add LRU validation cache with OpenTelemetry metrics - #1936

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sigstore:mainfrom

nissessenap:metrics

Commits on Feb 16, 2026

test: add LRU cache unit and integration tests (TDD Red)

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claude
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bcf8d3a
feat: implement LRU+TTL cache for validation results

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ccd8e3b
feat: add opt-in CLI flags to enable validation result cache

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481f870
fix: defensive copy in cache Set, update copyright, extract test helper

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8013c95
feat: add cache hit/miss debug logging and e2e test resources
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2d1dd26
intial reserach metrics
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03c8dfe
chore(deps): bump knative.dev/pkg to latest for OTEL metrics

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e027623
make reserach decent....
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cd4a38d
plan
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6349c2e
update plan
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8fbc75d
feat: add OpenTelemetry cache metrics for LRU validation cache

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claude
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6a3a629
refactor: move gauge registration to LRUCache instance to prevent callback accumulation

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34f5e68

Commits on Feb 17, 2026

refactor: move registerEntriesGauge to metrics.go for cohesion

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08e88b6