Alert: Attacker Attacking

[Aeudian]

Good Evening,

I am looking to find out if a mod exists or can exist that would alert, by means of flashing/text/sound when a target begins to attack you that is "not" your primary target.

For example, you are killing a mob in a zone and a player begins to attack you, or you are killing a mob and another mob begins to attack you.

I guess what I am really looking for is for something that alerts me when a player (PVP) begins to attack me while I'm in combat with an NPC.

Thanks, Aerlynn.