Highlight action bar buttons and Cooldown Manager icons that are interrupts with a glow and a timer when your target (or focus with @focus macro) is casting a spell that can be interrupted.

For World of Warcraft Midnight. If you are using a WoW version without the new addon restrictions, it is part of my earlier addon LiteButtonAuras.

Supports:

• Blizzard action bar buttons
• Blizzard cooldown manager icons
• Dominos action bar buttons
• ElvUI action bar buttons, and any other addon that uses LibActionButton-1.0

Due to the restrictions, it's not possible to show the highlight only when your interrupt will be off cooldown before the cast ends. Or if it is, I haven't figured out how.