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import express from 'express'

import { noCacheControl } from './cache-control'

import statsd from '@/observability/lib/statsd'

const router = express.Router()

// Moda may use this endpoint to decide whether an instance stays in the pool.

// It always returns 200 and sends memory gauges to StatsD, without testing service health.

router.get('/', function healthcheck(req, res) {

noCacheControl(res)

const mem = process.memoryUsage()

statsd.gauge('memory_heap_used', mem.heapUsed, ['event:healthcheck'])

statsd.gauge('memory_heap_total', mem.heapTotal, ['event:healthcheck'])

statsd.gauge('memory_rss', mem.rss, ['event:healthcheck'])

statsd.gauge('memory_external', mem.external, ['event:healthcheck'])

res.sendStatus(200)

})

export default router