Hello,
I must admit I am not often here to find information’s… so, I hope I am at the right place with my question in this “sub-thread” …
Is there a Addon that would show me (for example) if I use “Warrior->Revange” several times within a certain time-period on the same mob that the mob has now become immune to that “style” …(that would save Rage until the immunity-timer disappears)
I do solo questing mostly on higher mobs .(I like that) . so it would be worth to know if the mob “has become immune” to that at longer fights.
Meaning: The Addon should know that a “Revange” style would be pointless because the mob is currently immune …before I hit the mob… 
Thx in advance…
If you mean ‘waiting for parries to spam revenge’ this is not a style of play that exists in modern WoW.
In the old times you could get a Revenge proc on every parry, this is not the case today. This trick was mainly used in PvP to crush Rogues and other Warriors.
In the modern game flashing Revenge! procs are somewhat gated behind an internal timer to limit how often you can use the free version of the ability. You also cannot stack parry to a high degree due to how the stat system works.
So, no, this isn’t a valid style of play and there is no mob immunity to revenge.
If you are talking about using stuns on mobs? Then you can’t stun a mob more than 3 times in 18 seconds.