Enrage timer visibility

[Azuri]

That's sort of a different kind of enrage.
A "do this mechanic before the timer or you'll wipe" rather than a "if the boss isn't dead by the end of this cast you'll wipe".

The former tends to be mid-encounter, where the latter is the full stop end of the fight.

Vast majority of those gauges are "kill X thing before the bar is full". It is no different than a full fight enrage.