I have been using this addon at a personal level and it was adapted from
Purge Tracker addon created by
@code65536.
This addon will track who in your group has minor berserk buff from Combat Prayer in the current Trials, arenas and all the DLC dungeons.
Just install it and go into one of the locations listed above with a group. You can reposition the status panel by dragging it around with your mouse. If someone has a minor Berserk buff (Combat Prayer), they will be highlighted in green (if the person with the minor Berserk buff is you, it will be a slightly different color--bright green--to help you quickly spot when an effect is on you personally).