Vengeance "gain rage when hit by an enemy" notable

Will the rage gain when you are hit trigger the 0.5 second cooldown before being able to gain rage again?

If this is the case then taking this node will brick rage builds while mapping as you're never going to be gaining the 7-15 rage per hit with attacks since it will constantly be getting put on CD by the vengeance notable.

Would be nice to have clarification if this node has a separate cooldown for its type of rage gain.

Good point.

I seriously hope these are separate, but I doubt they are.

This seems like an intentional decision. More of a "we've given you situational rage generation", with this option being a brainless, mapping rage option.