/
healthcheck.js
53 lines (41 loc) · 1.31 KB
/
healthcheck.js
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'use strict';
const express = require('express');
const register = require('prom-client').register;
const Counter = require('prom-client').Counter;
const server = express();
const config = require('./../config/default');
const hostname = config.metrics.dockerHost;
const version = config.metrics.version;
const sha = config.metrics.commitSha;
const serviceHeartbeatCounter = new Counter({
name: 'service_is_alive',
help: 'Check if service is working.',
labelNames: ['alive'],
});
const updateServiceStatus = () => {
serviceHeartbeatCounter.inc({alive: hostname});
};
const serviceVersion = new Counter({
name: 'service_version',
help: 'Check service version.',
labelNames: ['version'],
});
serviceVersion.inc({version});
const serviceCommitSha = new Counter({
name: 'service_commit_sha',
help: 'Check service commit sha.',
labelNames: ['commit_sha'],
});
serviceCommitSha.inc({commit_sha: sha});
server.get('/', (req, res) => {
res.status(200);
res.end('<p>It is working!</p>');
});
server.get('/metrics', (req, res) => {
res.status(200);
res.set('Content-Type', register.contentType);
res.end(register.metrics());
});
console.log(`Server listening to ${config.server.port}, metrics exposed on /metrics endpoint`);
server.listen(config.server.port);
module.exports = { server, updateServiceStatus };