the difference between maint mode and none maint mode

the difference between maint mode and none maint mode?
When you have the server in maintenance mode it doesn’t send any alerts.   If we left it in maintenance mode and errors were happening, it would not tell us.  When we know we are working on a server, we put it in maint mode to avoid the alerts since we know we are actively looking and working on it.

Maintenance mode probably does other things to, this is just what I know of…