The objective of the addon is to provide a non-config, no-nonsense addon that announces spell-interrupts, whilst taking as little resources as possible. Note that these are hard-interrupts. It does not capture stuns, fears and other forms of CC that interrupt spellcasting. There are a lot of mainstream Interrupt Announce addons on the market and I'm fairly confident most of them offer a lot more functionality and configuration options. Elvui offers this functionality natively, for example. If you don't already have a way to announce addons, but would like to have it with as little resources as possible (currently 4kbs of ram) this is the addon for you.
This is a complete rework of the ImmortalisAnnounce addon as originally made by Zelcandor, improved by Sherrim and later revitalised by Kabandhur.