Schema.ai· vLLM
vLLM official site ↗vLLM v0.23.0API up

In vLLM v0.23.0, vllm:num_requests_waiting_by_reason is a Prometheus gauge with reason labels capacity and deferred, and its reasons sum to vllm:num_requests_waiting.

MetricvLLM v0.23.0confidence: highverified 13 min agoverified-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:471-491)
definesprimarysource_codecode_introspection

Does not establish

  • that capacity waits are caused by a specific configuration knob
  • that deferred waits are always due to one named subsystem
  • a recommended threshold for either reason label

Guards

  • vllm_version = v0.23.0
  • metric_name = vllm:num_requests_waiting_by_reason
  • runtime_component = scheduler

Freshness

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