It works purely on aggro generated either as an individual or a group.

When Paladins used to have flash you could get full credit spamming nothing but that. I would come in late to many fates and go into tank stance and flash as much as I could and would often get gold only participating 30 seconds or less.

Now, when new people come into a fate if you want them to get credit you can hit them with the tank ability SHIRK which gives them a portion of your aggro.

Provoke does nothing to FATE mobs.