Introduction to Appmetrics

Appmetrics is a powerful and versatile monitoring tool designed to track the performance and health of your applications. By integrating Appmetrics into your application, you gain access to a wealth of data, allowing you to optimize performance, troubleshoot issues, and ensure a smooth user experience.

Getting Started with Appmetrics

To get started with Appmetrics, you first need to install the module:

  npm install appmetrics

Next, require it in your application:

  const appmetrics = require('appmetrics');

Using Appmetrics API

Appmetrics offers dozens of APIs for monitoring various aspects of your application. Below are some of the key APIs with examples:

Monitoring CPU Usage

  const monitoring = appmetrics.monitor();
  monitoring.on('cpu', (data) => {
    console.log('CPU percentage: ' + data.process);
  });

Tracking Memory Usage

  monitoring.on('memory', (data) => {
    console.log('Memory heap size: ' + data.private);
  });

HTTP Request Timing

  monitoring.on('http', (data) => {
    console.log('HTTP request duration: ' + data.duration);
  });

These APIs enable you to monitor crucial metrics, providing insights into your application’s performance.

Full Example: Monitoring an Express App

Let’s create a simple Express application and integrate Appmetrics:

  const express = require('express');
  const app = express();
  const appmetrics = require('appmetrics');
  const monitoring = appmetrics.monitor();
  
  monitoring.on('cpu', (data) => {
    console.log('CPU percentage: ' + data.process);
  });
  
  monitoring.on('memory', (data) => {
    console.log('Memory heap size: ' + data.private);
  });
  
  monitoring.on('http', (data) => {
    console.log('HTTP request duration: ' + data.duration);
  });
  
  app.get('/', (req, res) => {
    res.send('Hello World!');
  });
  
  app.listen(3000, () => {
    console.log('Server is listening on port 3000');
  });

In this example, we created an Express application and integrated Appmetrics to monitor CPU usage, memory usage, and HTTP request timings.

By leveraging the comprehensive API provided by Appmetrics, you can keep a close eye on your application’s performance and make data-driven decisions to improve it.

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