Is it a duplicate question?
Nope

Is your feature request related to a problem? Please describe.
Currently the notifications send on both service up and service down - but not only up, or only down.

Describe the solution you'd like
It would be nice if we could specify we only wanted the notification to send when the service went down (or when it comes back online) (or both).

Describe alternatives you've considered
-NA-

Additional context
I'm using this program to monitor (among other things) a minecraft server, and notify the server owner when his server is down. He's mentioned it's a bit annoying to get the 'server up' notification since he's literally the person who restarted the server.