we have 4 blizzard alerts to show the rotation,
right alert shows overpower and it will be turned orange at 2 charges and dissapear with 0 charges.
left alert shows mortal strike it will be turned orange when execute can be used.
middle alert will appear when whirlwind can be used and turned grey if the target isn't affect by rend it will be turned red if colosus smash or thunderous roar aren't in cd.