elastic-apm-node/lib/metrics/reporter.js

The official Elastic APM agent for Node.js

'use strict'

const { Reporter } = require('measured-reporting')
const afterAll = require('after-all-results')

class MetricsReporter extends Reporter {
  constructor (transport, options = {}) {
    super(options)
    this.enabled = options.enabled
    this.transport = transport

    if (!this.enabled) {
      this.shutdown()
    }
  }

  _reportMetrics (metrics) {
    const data = {
      timestamp: Date.now() * 1000,
      tags: this._getDimensions(metrics),
      samples: {}
    }

    const next = afterAll(() => {
      metrics.forEach(metric => {
        data.samples[metric.name] = {
          value: metric.metricImpl.toJSON()
        }
      })

      if (this.enabled) {
        this.transport.sendMetricSet(data)
      }
    })

    this._registry.collectors.forEach(function (collector) {
      collector.collect(next())
    })
  }
}

module.exports = MetricsReporter