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Status Delivered
Workspace Instana
Categories Synthetic
Created by Guest
Created on Sep 22, 2023

Add node_module prom-client to synthetic-pop-javascript-playback-engine


This idea, makes alot of sense for people that wants to use synthetic checks to query a prometheus endpoint. 

Implementation from your side is simply add the prom-client module in synthetic checks pods.



If you add the prometheus module, we will be able to use this module to query prometheus metrics and use them in the synthetic checks.

Example, collect metrics from Prometheus endpoint:

const http = require('http')

const url = require('url')

const client = require('prom-client')

// Create a Registry which registers the metrics

const register = new client.Registry()

// Add a default label which is added to all metrics


  app: 'example-nodejs-app'


// Enable the collection of default metrics

client.collectDefaultMetrics({ register })

// Define the HTTP server

const server = http.createServer(async (req, res) => {

  // Retrieve route from request object

  const route = url.parse(req.url).pathname

  if (route === '/metrics') {

    // Return all metrics the Prometheus exposition format

    res.setHeader('Content-Type', register.contentType)




// Start the HTTP server which exposes the metrics on http://localhost:8080/metrics



Then I can process the data and trigger a synthetic check when a series is not as expected.

From your side you only need to have the module available in the modules directory, to install you can simply:

npm install prom-client


Idea priority Urgent
  • Admin
    Dania Grave de Peralta Reyes
    Oct 16, 2023
    Support for prom-client module will be included in chart version 1.1.0, released with Instana v260
  • Admin
    Cross Ganaway
    Sep 27, 2023

    Hi. We will consider adding this module in a future build of the PoP engine. Keep in mind that the PoP will timeout a script that executes for too long, so you don't want to have an overly complex script processing the response.

    1 reply