@metrics/process/lib/collector-process-start-time.js

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

"use strict";

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

const START_TIME = Math.round(Date.now() / 1000 - process.uptime());

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

		Object.defineProperty(this, "collected", {
			writable: true,
			value: false,
		});
	}

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

	collect(timestamp) {
		if (this.collected) {
			return null;
		}

		this.collected = true;

		return [
			new Metric({
				name: `${this.prefix}process_start_time_seconds`,
				description: "Start time of the process since unix epoch in seconds.",
				type: 1,
				value: START_TIME,
				timestamp,
			}),
		];
	}
};

module.exports = CollectorProcessStartTime;