overleaf/libraries/metrics
Jakob Ackermann 39189978ac Merge pull request #17170 from overleaf/jpa-node-18-19-1
[misc] upgrade Node.js to 18.19.1

GitOrigin-RevId: 1bd2008682b585c3fccc65f74c90ba7fc9edc023
2024-02-20 09:04:55 +00:00
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test Merge pull request #16519 from overleaf/bg-clsi-timeouts-add-metrics 2024-01-18 09:04:19 +00:00
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overleaf/metrics-module

Wrappers the prom-client npm module to provide Prometheus metrics at /metrics.

Use:

// Metrics must be initialized before importing anything else
require('@overleaf/metrics/initialize')

const express = require('express')
const metrics = require('@overleaf/metrics')
const app = express()
metrics.injectMetricsRoute(app)

Request logging can be enabled:

const logger = require('@overleaf/logger')
...
app.use(metrics.http.monitor(logger))

The metrics module can be configured through the following environment variables:

  • DEBUG_METRICS - enables display of debugging messages to the console.
  • GCP_OPENTELEMETRY - enables OpenTelemetry tracing for GCP
  • JAEGER_OPENTELEMETRY - enables OpenTelemetry tracing for Jaeger (in the dev environment)
  • METRICS_APP_NAME - the app label for metrics and spans
  • METRICS_COMPRESSION_LEVEL - sets the compression level for /metrics
  • STACKDRIVER_LOGGING - toggles the request logging format
  • UV_THREADPOOL_SIZE - sets the libuv thread pool size