SGLang: a request-queue-time histogram under vLLM's name - VERIFIED ABSENT

VERIFIED NEGATIVE. SGLang does not emit a request-queue-time histogram under vLLM's name. sglang:request_queue_time_seconds is NOT a metric this engine registers - it is recorded here under the conventional name a reader would go looking for so the absence is queryable rather than implied by a gap in a list. SGLang names it sglang:queue_time_seconds (recorded in this set), so a scraper or alert written against vLLM's vllm:request_queue_time_seconds matches nothing here. This is a naming divergence, not a capability gap - the metric itself exists. What was searched: grep for name="sglang:request_queue_time_seconds" in metrics_collector.py returns zero hits; the only queue-time histogram is sglang:queue_time_seconds.. Do not read this record's metric_name as something the engine exports; it is the name that is missing.