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FreeRelic

FreeRelic is Open Source analogue of NewRelic RPM.

There’s an example application at https://github.com/devmen/FreeRelicTest.

Useful links

• https://github.com/josevalim/rails-footnotes
  It displays footnotes in your application for easy debugging, such as sessions, request parameters, cookies, filter chain, routes, queries, etc.

• https://github.com/engineyard/rails_metrics
  RailsMetrics is an engine that hooks into your application to listen ActiveSupport::Notifications and show you statistics about them. RailsMetrics uses threads to save those notifications in the database through an in-process Queue. You can see charts based on each request and see what queries, actions, templates rendering, etc. are slow.