This makes a popup text weakaura show at a specific time in a specific fight at a specific time. Can be used on any boss in any raid as long as you customize it yourself.
Currently it isnt set to any encounter so you must set it to one or it will pop up when in combat with any boss.
To set it to a specific encounter you MUST set the Encounter ID, use this website for the ID's you need: https://wowpedia.fandom.com/wiki/DungeonEncounterID