@metrics/process/lib/collector-cpu-total.js

Module for collecting different process and system metrics and providing them as a metric stream

"use strict";

const Metric = require("@metrics/metric");

const CollectorCpuTotal = class CollectorCpuTotal {
	constructor(prefix = "") {
		Object.defineProperty(this, "prefix", {
			value: prefix,
		});

		Object.defineProperty(this, "previousSample", {
			writable: true,
			value: process.cpuUsage(),
		});
	}

	get [Symbol.toStringTag]() {
		return "CollectorCpuTotal";
	}

	collect(timestamp) {
		const sample = process.cpuUsage();

		const userUsageMicros = sample.user - this.previousSample.user;
		const systemUsageMicros = sample.system - this.previousSample.system;

		this.previousSample = sample;

		const cpuUserUsageCounter = new Metric({
			name: `${this.prefix}process_cpu_user_seconds_total`,
			description: "Total user CPU time spent in seconds",
			type: 2,
			value: userUsageMicros / 1e6,
			timestamp,
		});

		const cpuSystemUsageCounter = new Metric({
			name: `${this.prefix}process_cpu_system_seconds_total`,
			description: "Total system CPU time spent in seconds",
			type: 2,
			value: systemUsageMicros / 1e6,
			timestamp,
		});

		const cpuUsageCounter = new Metric({
			name: `${this.prefix}process_cpu_seconds_total`,
			description: "Total user and system CPU time spent in seconds",
			type: 2,
			value: (userUsageMicros + systemUsageMicros) / 1e6,
			timestamp,
		});

		return [cpuUserUsageCounter, cpuSystemUsageCounter, cpuUsageCounter];
	}
};

module.exports = CollectorCpuTotal;