vLLM v0.23.0 · Version scoped

In vLLM v0.23.0, `vllm:num_requests_waiting_by_reason` is registered with the label names `model_name`, engine, reason.

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

Metric

num_requests_waiting_by_reason

Applies when

PrometheusStatLogger metrics publisherV1 metrics

Evidence

vLLM v0.23.0 v1 metrics loggers.py(vllm/v1/metrics/loggers.py:471-482)

definesprimarysource_codecode_introspection

Open cited lines in immutable upstream source ↗

471:         gauge_waiting_by_reason = self._gauge_cls(
472:             name="vllm:num_requests_waiting_by_reason",
473:             documentation=(
474:                 "Number of waiting requests by reason. "
475:                 "Reason labels: 'capacity' = waiting for scheduling capacity; "
476:                 "'deferred' = deferred by transient constraints "
477:                 "(LoRA budget, KV transfer, blocked status). "
478:                 "Sum of all reasons equals vllm:num_requests_waiting."
479:             ),
480:             multiprocess_mode="mostrecent",
481:             labelnames=labelnames + ["reason"],
482:         )

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

the set of values any of these labels takes at runtime
label cardinality in a deployment

Guards

vllm_version = v0.23.0
metric_name = vllm:num_requests_waiting_by_reason

Freshness

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