In vLLM v0.23.0, `vllm:prefix_cache_queries` counts tokens presented to the first-party prefix-cache lookup, accumulated as a counter.

MetricvLLM v0.23.0confidence: highverified 11 hr agoverified-code

Metric

prefix_cache_queries

Applies when

PrometheusStatLoggerV1 metrics

Evidence

vLLM v0.23.0 v1 metrics loggers.py(vllm/v1/metrics/loggers.py:562-588)

definesprimarysource_codecode_introspection

Does not establish

a workload-independent healthy threshold
semantics in any vLLM version other than v0.23.0

Guards

vllm_version = v0.23.0
metric_name = vllm:prefix_cache_queries

Freshness

Pinned release-tag semantics; do not carry to another version without continuity evidence.