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What kind of "alarm" are you looking for? In cases like this, I frequently use the Email tool to send myself a message stating that something isn't working. Something like this should do the trick:
Using your DateTime field, the Filter grabs just those records created in the last 5 minutes. The Count Records tool then does a count, and the second Filter checks that count to see if it is 0. The Email tool then sends a message, alerting you or whomever else that there's an issue.