UNIT POWER UPDATE

Fired when a unit's current power (mana, rage, focus, energy, runic power, holy power, ...) changes. See below for details.
 UNIT_POWER_UPDATE: unitTarget, powerType
==Payload==
:;unitTarget: : UnitId
:;powerType: - resource whose value changed: "MANA", "RAGE", "ENERGY", "FOCUS", "HAPPINESS", "RUNIC_POWER", "HOLY_POWER".
==Details==
This event is fired under the following conditions:
* A spell is cast which changes the unit's power.
* The unit reaches full power.
* While the unit's power is naturally regenerating or decaying, this event will only fire once every two seconds. See UNIT_POWER_FREQUENT for a more exact alternative.
==Patch changes==