2021-10-28 05:23:06 -04:00
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# overleaf/metrics-module
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2021-03-16 07:47:18 -04:00
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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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const metrics = require('@overleaf/metrics')
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metrics.initialize('myapp')
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const express = require('express')
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const app = express()
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metrics.injectMetricsRoute(app)
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```
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2021-03-16 07:47:18 -04:00
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Request logging can be enabled:
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2021-03-16 07:47:18 -04:00
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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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2021-10-28 05:23:06 -04:00
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- `DEBUG_METRICS` - enables display of debugging messages to the console.
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- `ENABLE_TRACE_AGENT` - enables @google-cloud/trace-agent on Google Cloud
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- `ENABLE_PROFILE_AGENT` - enables @google-cloud/profiler on Google Cloud
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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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