Everything you need to know, wrapped up in a little nutshell
Munin Plugins Rails
Powered by Request log analyzer and railsdoctors
Munin Plugins Rails is a collection of Consise Munin plugins for Rails server environments. This will make monitoring your rails app a piece of cake. Most things in this repository rely heavily on the request log analyzer gem. Below are some examples of the output generated.

Passenger Status

Requests

Request Duration

Request Errors

Rails View Render Time

Database Time
Seen enough? Then Head over to github!