Module metrics 

Metrics registry trait and implementation for Prometheus metrics

This module provides a trait-based interface for creating and managing Prometheus metrics with automatic label injection and hierarchical naming support.

Modules

frontend_perf

Frontend pipeline stage and finer-grained perf metrics. Used by both runtime (route, transport_roundtrip) and llm (preprocess, postprocess, tokenize, template, detokenize).

prometheus_names

Prometheus metric name constants and sanitization utilities

request_plane

Request-plane metrics for AddressedPushRouter. Used to pinpoint serialization vs transport roundtrip latency.

tokio_perf

Tokio runtime metrics and event-loop canary

transport_metrics

Transport-layer Prometheus metrics (TCP + NATS). Statics are incremented directly in the client send paths.

work_handler_perf

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

Structs

Metrics

Wrapper struct that provides access to metrics functionality This struct is accessed via the .metrics() method on DistributedRuntime, Namespace, Component, and Endpoint

MetricsRegistry

Structure to hold Prometheus registries and associated callbacks for a given hierarchy.

Traits

MetricsHierarchy

PrometheusMetric

============================== Prometheus section

Functions

create_metric

============================== Metrics section

Type Aliases

PrometheusExpositionFormatCallback

Type alias for exposition text callback functions that return Prometheus text

PrometheusUpdateCallback

Type alias for runtime callback functions to reduce complexity