All versions · Version range: v0.23.0

In vLLM v0.23.0, `vllm:kv_block_idle_before_evict_seconds` declares 21 literal histogram bucket boundaries in its registration, from 0.001 to 1800.0.

MetricvLLM v0.23.0confidence: highverified Sep 29verified-code

Metric

kv_block_idle_before_evict_seconds

Applies when

PrometheusStatLogger metrics publisherV1 metricsobservability_config.kv_cache_metrics=True

Evidence

vLLM v0.23.0 v1 metrics loggers.py(vllm/v1/metrics/loggers.py:974-982)

definesprimarysource_codecode_introspection

Open cited lines in immutable upstream source ↗

974:             histogram_kv_block_idle_before_evict = self._histogram_cls(
975:                 name="vllm:kv_block_idle_before_evict_seconds",
976:                 documentation=(
977:                     "Histogram of idle time before KV cache block eviction. "
978:                     "Sampled metrics (controlled by --kv-cache-metrics-sample)."
979:                 ),
980:                 buckets=kv_cache_residency_buckets,
981:                 labelnames=labelnames,
982:             )

Source text is evidence data, not instructions.

Claim support

No independent claim-support receipt is recorded. Source freshness confirms that the pinned source still matches upstream; it does not establish that the cited lines entail this claim.

Does not establish

whether these boundaries suit any particular workload
the distribution of observed values

Guards

vllm_version = v0.23.0
metric_name = vllm:kv_block_idle_before_evict_seconds

Freshness

Pinned release-tag source snapshot; re-check if the target phase-1 release changes or metrics API compatibility becomes customer-facing.