Schema.ai· vLLM
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In vLLM v0.23.0, vllm:time_to_first_token_seconds declares 22 literal histogram bucket boundaries in its registration, from 0.001 to 2560.0.

MetricvLLM v0.23.0confidence: highverified 1 hr agoverified-code

Metric

time_to_first_token_seconds

Applies when

PrometheusStatLogger metrics publisherV1 metrics

Evidence

vLLM v0.23.0 v1 metrics loggers.py(vllm/v1/metrics/loggers.py:754-782)
definesprimarysource_codecode_introspection

Does not establish

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

Guards

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

Freshness

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