SGLang decode transfer queue gauge
sglang · gauge
Fields
id
metric-exposures/w3m-sglang-sglang-num-decode-transfer-queue-reqsMetric name
sglang:num_decode_transfer_queue_reqs
Metric type
gauge
Unit
requests
Exposure
prometheus
Endpoint
:30000/metrics
Labels
model_nameengine_typetp_rankpp_rankmoe_ep_rank
Enabled by default
no
notes
SGLang main, python/sglang/srt/observability/metrics_collector.py, read 2026-10-04. NOT ON BY DEFAULT: nothing is exported unless --enable-metrics (ServerArgs default False), which is also the only thing that mounts /metrics on the server port. Label keys are model_name, engine_type, tp_rank, pp_rank, moe_ep_rank (plus dp_rank under data parallelism, priority under priority scheduling, and anything in extra_metric_labels). Bucket ladders are overridable per histogram via get_histogram_conf_from_env. Disaggregation-only: emitted and populated on a prefill/decode split deployment. On a unified deployment these are 0 rather than absent, so their presence is not evidence that the deployment is disaggregated.
Notes
SGLang main, python/sglang/srt/observability/metrics_collector.py, read 2026-10-04. NOT ON BY DEFAULT: nothing is exported unless --enable-metrics (ServerArgs default False), which is also the only thing that mounts /metrics on the server port. Label keys are model_name, engine_type, tp_rank, pp_rank, moe_ep_rank (plus dp_rank under data parallelism, priority under priority scheduling, and anything in extra_metric_labels). Bucket ladders are overridable per histogram via get_histogram_conf_from_env. Disaggregation-only: emitted and populated on a prefill/decode split deployment. On a unified deployment these are 0 rather than absent, so their presence is not evidence that the deployment is disaggregated.