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FreeRelic is Open Source analogue of NewRelic RPM.
There’s an example application at https://github.com/devmen/FreeRelicTest.
It displays footnotes in your application for easy debugging, such as sessions, request parameters, cookies, filter chain, routes, queries, etc.
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.