The slack notification messages are gigantic, I want to trim almost all of the data out but can't find how to do it. My goal is to get one line notifications only from DOWN events, such as "https://example.org/ 8.13.4.256 is Down" - nothing else. How can I make this happen? 

I want to use slack reactions to see if a certain notification is handled or not. If we would get for example 50 down notifications in a day the flood of messages would make it really hard to actually react to each individual message and to see patterns or to see an overview of what has been toggling up/down over some weeks.