Module work_handler_perf 

Transport breakdown metrics for work handler (backend side). Captures network transit (T2-T1) and backend processing time (T3-T2).

Statics

WORK_HANDLER_NETWORK_TRANSIT_SECONDS

Network transit: frontend send to backend receive (wall-clock, cross-process).

WORK_HANDLER_TIME_TO_FIRST_RESPONSE_SECONDS

Backend processing: handle_payload entry to first response sent.

Functions

ensure_work_handler_perf_metrics_registered

Register work handler transport breakdown metrics with the given registry. Idempotent.

ensure_work_handler_perf_metrics_registered_prometheus

Register with a raw Prometheus registry. Idempotent.