StackWatch is a very that is meant to warn players about a user defined aura (buff/debuff). Players affected by the user specified aura is whispered and assigned an icon at either initial application or a specific stack.
This addon is very useful for PTR encounters and/or for encounters that do not have suitable aura warning systems.
To configure it, access it through the default WoW addon interface configuration menu.
- Press ESC
- Click Interface
- Click the Addon tab