If you forgot which M+ group or raid you joined: this weakaura reminds you with a few lines of text in your chat or a popup which exact group you joined.
It's not the best programmed WA to ever exist, bugs can occur, literally coded it in a few hours. I'll try to fix them asap but irl things might happen.
In the custom options you can enable / disable which category of content should show you a message, if you want to see either a popup or text in chat or change the format of the text.