You need to go here: https://wow.curseforge.com/addons/bandaid/
Download the addon AND import the Weak Aura. There are 3 WA's in a group. The WA's, from top to bottom, do:
- 1. Progress Bar, from 0% - 100%. This is HUGE! It measures how much healing LoD will do, and a full bar means full healing. Low bar means mostly overheal.
- 2. The number is the number of people in the cone in front of you.
- 3. Monitors the CD of LoD