Development environment for Prometheus and Grafana Demo

This example illustrates how to use [yabeda] gem suite with rails application to draw graphs for app metrics.

Prerequisites

Recent versions of Docker and Docker Compose installed.

Usage

• Execute docker-compose up to start.
• Go to rails application at http://localhost:5000
• Hit the button and refresh page few times
• Go to Grafana Web UI at localhost (user: admin/admin)
• Look for graphs
• After starting up docker-compose will run rails-stressor service to simulate huge load for the rails app. By default will do the request for 2 minutes. Settings could be changed in docker-compose.yml config (command parameter of the rails_stressor service).

You also could run rails stressor again by executing docker-compose up rails_stressor command.

Notes

• Sample [Rails] application is equipped with [yabeda-rails], [yabeda-sidekiq], [yabeda-puma-plugin], and [yabeda-prometheus] gems and properly configured.
• Raw rails metrics are exposed at http://localhost:5000/metrics
• Raw sidekiq metrics are exposed at http://localhost:5100/metrics
• Raw puma metrics are exposed at http://localhost:5100/metrics
• The [Prometheus] Web UI runs at http://localhost:9090
• The [Grafana] Web UI runs at http://localhost:3000 , user: admin/admin.
• The [Sidekiq] Web UI is available at http://localhost:5000/sidekiq

Acknowledgement

The Prometheus and Grafana goodies are from yabeda-rb and the Evil Martians crew. This is also a great blog post on Yabeda on the Evil Martian's blog.