alexandrit

Lighthouse metrics provisioner in the prometheus format (scratch version). Runs server on the specified port (3031 by default), uses puppeteer to calculate metrics in prometheus format and returns it on /metrics endpoint.

Installation

> npm i -g alexandrit

How to use

You should provide URL of web app to observe and optionally specify config.json which specifies puppeteer and lighthouse options.

> alexandrit <--url url-to-provision> \
            [--config=path to config.json] \
            [--port=port on which to listen ]

List of supported metrics (to be updated)

1. First Contentful Paint
2. First Meaningful Paint
3. Interactive (Time to Interactive)
4. Largest Contentful Paint

Configuration

Currently, you can only configure alexandrit using CLI option or environment variable ALEXANDRIT_CONFIG_FILE which specify path to the config file in json format (going to change to the yml).

config file structure

{
  "lighthouseFlags": {
    "logLevel": "info",
    "disableDeviceEmulation": true,
    "chromeFlags": ["--disable-mobile-emulation", "--headless"]
  },
  "lighthouseConfig": {
    "extends": "lighthouse:default",
    "settings": {
      "emulatedFormFactor": "desktop"
    }
  },
  "puppeteerConfig": {
    "args": ["--no-sandbox"]
  }
}