SGLang KV-transfer speed histogram
sglang · histogram
Fields
id
metric-exposures/w3m-sglang-sglang-kv-transfer-speed-gb-sMetric name
sglang:kv_transfer_speed_gb_s
Metric type
histogram
Unit
GB/s
Exposure
prometheus
Endpoint
:30000/metrics
Histogram buckets
0.10.515102550100200400
Labels
model_nameengine_typetp_rankpp_rankmoe_ep_rank
Enabled by default
no
Phase scoped
yes
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. Effective transfer bandwidth. The only engine here that makes the disaggregated KV handoff itself observable as a rate.
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. Effective transfer bandwidth. The only engine here that makes the disaggregated KV handoff itself observable as a rate.