Introduction to AppMetrics

AppMetrics is a powerful library designed for monitoring the performance of applications. It provides dozens of useful APIs to measure various metrics such as response time, CPU usage, memory consumption, and more.

Getting Started with AppMetrics

  
    const appmetrics = require('appmetrics');
    const monitoring = appmetrics.monitor();
  

API Examples

CPU Monitoring

  
    monitoring.on('cpu', (cpu) => {
      console.log('CPU: %s', cpu);
    });
  

Memory Monitoring

  
    monitoring.on('memory', (memory) => {
      console.log('Memory: %s', memory);
    });
  

HTTP Requests Monitoring

  
    monitoring.on('http', (http) => {
      console.log('HTTP: %s', http);
    });
  

Profiling the Application

  
    monitoring.on('profile', (profile) => {
      console.log('Profile data: %s', profile);
    });
  

Application Example

Here’s a basic Express.js application that uses AppMetrics to monitor its performance:

  
    const express = require('express');
    const appmetrics = require('appmetrics');
    const monitoring = appmetrics.monitor();
    const app = express();

    app.get('/', (req, res) => {
      res.send('Hello World!');
    });

    app.listen(3000, () => {
      console.log('Example app listening on port 3000!');
    });

    monitoring.on('cpu', (cpu) => {
      console.log('CPU: %s', cpu);
    });

    monitoring.on('memory', (memory) => {
      console.log('Memory: %s', memory);
    });

    monitoring.on('http', (http) => {
      console.log('HTTP: %s', http);
    });

    monitoring.on('profile', (profile) => {
      console.log('Profile data: %s', profile);
    });
  

By integrating AppMetrics with your application, you can gain insights into its performance and make informed decisions to optimize it.

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