Monitor

The @esmj/monitor is module for collecting node metrics from native node API.

Requirements

• Node 18+

Install

npm install @esmj/monitor

Usage

It works for both Javascript modules (ESM and CJS).

// server.js
import { createMonitor } from '@esmj/monitor';

const { monitor } = new createMonitor();

const unsubscribe = monitor.subscribe((metrics) => {
  console.log(metrics);
});

monitor.start();

setTimeout(() => {
  unsubscribe();
  monitor.stop();
}, 15000);

API

monitor = new Monitor(options?)

Create a new instance of Monitor.

options?

Type: object

Configure the new instance of Monitor.

options.interval?

Type: integer Default: 1000

Measure interval metric.

start()

Monitoring start measure node metric.

stop()

Monitoring stop measure node metric.

subscribe(listener)

Subscribe listener for metrics.

Returns an unsubscribe method.

unsubscribe(listener)

Remove subscription.

add(metric)

Monitoring start measure node metric.

metric

Type: Metric

Add new metric to monitoring.

remove(metric)

Remove defined metric from monitoring.