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

const { monitor, metricsHistory } = new createMonitoring();

const unsubscribe = monitor.subscribe((metrics) => {
  console.log(metrics);
//   {
//   cpuUsage: { user: 1692, system: 925, percent: 0.26 },
//   eventLoopDelay: {
//     min: 20.07,
//     max: 21.15,
//     mean: 20.78,
//     stddev: 0.38,
//     percentile80: 21.08
//   },
//   eventLoopUtilization: {
//     idle: 992.72,
//     active: 7.85,
//     utilization: 0.01
//   },
//   loadAverage: {
//     minute1: 3.38,
//     minute5: 8.28,
//     minute15: 9.15
//   },
//   memoryUsage: {
//     percent: 5.23,
//     rss: 54.2,
//     heapTotal: 20.2,
//     heapUsed: 17.74,
//     external: 0.9,
//     arrayBuffers: 0.07
//   },
//   gc: { entry: null },
//   process: {
//     pid: 53509,
//     ppid: 53480,
//     platform: 'darwin',
//     uptime: 14.656514084,
//     version: 'v18.12.1'
//   }
// }
});

monitor.start();

setTimeout(() => {
  console.log(metricsHistory.percentile('cpuUsage.percent', 80)); // 1 
  console.log(metricsHistory.percentile('memoryUsage.rss', 80)); // 61
}, 5000);

setTimeout(() => {
  unsubscribe();
  monitor.stop();
  console.log(metricsHistory.percentile('cpuUsage.percent', 80)); // undefined 
  console.log(metricsHistory.percentile('memoryUsage.rss', 80)); // undefined
}, 15000);