This video covers three types of aura triggers: 1. Tracking a Buff on a player 2. Tracking a debuff on a player 3. Becoming alerted when an ability comes off cooldown.
I'm doing these on an arcane mage and tracking clearcasting, arcane blast, and arcane missiles respective but the principle can be used to track any kind of buff, debuff on nearly any unit including your traget, pet, bosses, arena targets, or raid members.