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In vLLM v0.23.0, vllm:spec_decode_num_drafts is registered as a Prometheus counter when `speculative_config is not None`.

MetricvLLM v0.23.0confidence: highverified 13 min agoverified-code

Metric

spec_decode_num_drafts

Applies when

PrometheusStatLogger metrics publisherV1 metricsspeculative_config is not None

Evidence

vLLM v0.23.0 v1 spec_decode metrics.py(vllm/v1/spec_decode/metrics.py:154-158)
definesprimarysource_codecode_introspection

Does not establish

  • the metric's unit of measure
  • what the metric measures semantically
  • a healthy or expected value range

Guards

  • vllm_version = v0.23.0
  • metric_name = vllm:spec_decode_num_drafts

Freshness

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