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Library for measuring RED metrics in the fastify app


import fastify from 'fastify';
import { fastifyMeasureRequests } from '@tinkoff/measure-fastify-requests';
import { Counter, Histogram } from 'prom-client';

const app = fastify();

app.register(fastifyMeasureRequests, {
metrics: {
counter: (opt) => new Counter(opt),
histogram: (opt) => new Histogram(opt),

In the prom-client registry new metrics will be available:

  • http_requests_total - number of incoming requests;
  • http_requests_errors - number of errors in the incoming requests;
  • http_requests_execution_time - histogram with the request handler execution time.
  • http_requests_first_byte_time - histogram with the request handler first byte sent time.