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api.hyungi.net/node_modules/pm2/lib/templates/sample-apps/pm2-plus-metrics-actions/README.md

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+
+# pm2 custom metrics boilerplate
+
+In this boilerplate you will discover a working example of custom metrics feature.
+
+Metrics covered are:
+- io.metric
+- io.counter
+- io.meter
+- io.histogram
+
+## What is Custom Metrics?
+
+Custom metrics is a powerfull way to get more visibility from a running application. It will allow you to monitor in realtime the current value of variables, know the number of actions being processed, measure latency and much more.
+
+Once you have plugged in some custom metrics you will be able to monitor their value in realtime with
+
+`pm2 monit`
+
+Or
+
+`pm2 describe`
+
+Or on the PM2+ Web interface
+
+`pm2 open`
+
+## Example
+
+```javascript
+const io = require('@pm2/io')
+
+const currentReq = io.counter({
+  name: 'CM: Current Processing',
+  type: 'counter'
+})
+
+setInterval(() => {
+  currentReq.inc()
+}, 1000)
+```
+
+## Documentation
+
+https://doc.pm2.io/en/plus/guide/custom-metrics/