Configure alerts when file is not updated regularly.

My situation, we have a file that moves via Serv-U and gets updated regularly, about every minute and needs to 24x7.  A few times a day the client automation disconnects and reconnects quickly, I'm able to get alerts on that.  I'd like to get an alert when for example the files(s) have not been updated in 5 minutes, or the user disconnected and did not reconnect within a minute?  Anyone ever done that or know a way to do that?