This WA tracks your Jonat's Natural Focus legendary's stack count and remaining duration.
It glows at 4 stacks, assuming you really want to be notified that you have a decent buff to chain heal.
With 4 or 5 stacks and less than 5 seconds left, the glow turns red, warning you that your window is closing.
With 4 or 5 stacks and less than 2.3 seconds left, a RESET!! warning pops up to let you know that you need to cast another Healing Surge to reset the duration because you don't have enough time to cast Chain Heal (or Healing Wave) before the buff disappears.
The 2.3 seconds was based on my shaman at the time of creation, for more accuracy, you can adjust this number under Condition 1.
Happy Keying!