This is a patch i'm interested in submitting to rails https://github.com/schneems/rails/commits/schneems/log_controller_filters/ (last two commits) but first I want some feedback. Here is a writeup similar to how I would structure a PR. All comments welcome, especially alternative implementation & style, here it goes...
UPDATE: Pull request submitted, please post any comments there: rails/rails#3929
Adding the ability to easily log callbacks.