This module is meant to be a tool for module developers. It is not intended to be used in a published gallery.
In particular, it traps all* of the event hooks and adds an info status message (with a timestamp) to help get a better understanding of what events are being triggered by any given action.
Just add this module to your gallery3 installation.
Simple as that!
This is pretty bare-bones with no customization available, feel free to use it, tweak it, enhance it, etc. If you make a change that you think others might like, consider updating the version in the gallery3-contrib project as well.