Caching
Cache hit rate
Quick answer
Cache hit rate is the proportion of cache lookups that find a usable entry, expressed as a percentage.
Cache hit rate is the proportion of cache lookups that find a usable entry, expressed as a percentage.
Why it matters
It is the single most predictive metric for CI wall-clock time. Below 80% something is wrong with your key; chasing bigger runners before fixing it wastes money.
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Related
Artifact cacheAn artifact cache stores build outputs between CI runs so that unchanged work does not have to be recomputed.Cache evictionCache eviction is the removal of cache entries to stay within a size limit, usually by discarding the least recently used entries first.Cache keyA cache key is the string that identifies a cache entry, typically built from a hash of the lockfiles that determine the cached content.Cache scopeCache scope defines which workflows, branches and repositories may read a given cache entry.