Custom Prometheus Ruby Client

This repo is essentially a fork of https://github.com/prometheus/client_ruby and adds the following behaviour to the captured metrics.

• It takes the service_name as an options to the rake middleware (see usage)
• It adds the following labels to the metrics
  • User Agent
  • Accept
  • Content Type

Usage

Add the following to your Gemfile

gem 'custom-prometheus-client'

Then in your config.ru add the following (Change 'my_app' to the name of your app being monitored)

require 'prometheus/client/rack/collector'
require 'prometheus/client/rack/exporter'

options = { service_name:  'my_app'}
use Prometheus::Client::Rack::Collector, options
use Prometheus::Client::Rack::Exporter

Configure your prometheus.yml to scrape /metrics from rails service