@heyhru/server-plugin-metrics

Fastify plugin for Prometheus metrics collection. Exposes a /metrics endpoint and tracks HTTP request duration.

Install

pnpm add @heyhru/server-plugin-metrics

Usage

import Fastify from "fastify";
import { metricsPlugin } from "@heyhru/server-plugin-metrics";

const app = Fastify();
await app.register(metricsPlugin);

// GET /metrics returns Prometheus-format metrics

API

metricsPlugin

Fastify plugin (wrapped with fastify-plugin).

• Decorates each request with _reqStartMs to measure duration
• Records http_request_duration_seconds histogram (labels: method, route, status_code)
• Registers GET /metrics endpoint (log level: silent)

Exports

| Export | Type | Description | | ----------------------- | ----------- | ---------------------------------------- | | metricsPlugin | Plugin | Fastify plugin | | register | Registry | Prometheus registry (for custom metrics) | | httpRequestDuration | Histogram | HTTP request duration histogram | | Histogram | Class | Re-exported from prom-client | | Gauge | Class | Re-exported from prom-client | | Counter | Class | Re-exported from prom-client | | Summary | Class | Re-exported from prom-client |