If 3 or more players in your party have the Moonkin aura, but you don't, the icon will appear and let you know that you probably need to adjust your position.
Same story for Atiesh mage and warlock versions.
In order to save stress on constant aura checks, this weakaura is only loaded if all of the below is true:
You are:
- in combat
- in an encounter
- in a raid
- level 60
- either a Mage, Warlock, Priest, Druid, Shaman or Paladin