Node Grafana/Prometheus Performance Monitoring

node-monitoring.md

Monitor in Node (PerformanceObserver is not yet implemented in Bun. in bun 1.0.3)

import { collectDefaultMetrics, register } from 'prom-client'

if (req.method === 'GET' && pathname === '/metrics/') {
  return new Response(await register.metrics(), {
    headers: {
      'Content-Type': register.contentType,
    },
  })
}

In fly.toml

[metrics]
port = 4000
path = "/metrics"

Then inspect at https://fly-metrics.net/