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5855ba7b49
Replace the GCP trace agent with OpenTelemetry GitOrigin-RevId: 591410029349e4ef5a39a5b79868e57c7bd089b6
33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
# overleaf/metrics-module
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Wrappers the [prom-client](https://github.com/siimon/prom-client) npm module to provide [Prometheus](https://prometheus.io/) metrics at `/metrics`.
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Use:
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```
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// Metrics must be initialized before importing anything else
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require('@overleaf/metrics/initialize')
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const express = require('express')
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const metrics = require('@overleaf/metrics')
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const app = express()
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metrics.injectMetricsRoute(app)
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```
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Request logging can be enabled:
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```
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const logger = require('@overleaf/logger')
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...
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app.use(metrics.http.monitor(logger))
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```
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The metrics module can be configured through the following environment variables:
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- `DEBUG_METRICS` - enables display of debugging messages to the console.
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- `GCP_OPENTELEMETRY` - enables OpenTelemetry tracing for GCP
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- `JAEGER_OPENTELEMETRY` - enables OpenTelemetry tracing for Jaeger (in the dev environment)
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- `METRICS_APP_NAME` - the app label for metrics and spans
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- `METRICS_COMPRESSION_LEVEL` - sets the [compression level](https://www.npmjs.com/package/compression#level) for `/metrics`
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- `STACKDRIVER_LOGGING` - toggles the request logging format
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- `UV_THREADPOOL_SIZE` - sets the libuv [thread pool](http://docs.libuv.org/en/v1.x/threadpool.html) size
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