Alert rule is not working

I have setup to check send me an Alert message if there is no data, and this does not work.
Presently my system puts in the data every 30 min, I wanted to check there is no data, does the Alert work for me. So I have setup an Alert to check if the data ( count) is present within last 5 min ( in my case most of time it wont be present for every 5 min. And this alert does not work, I do not get the alert message ( I have setup the proper notification channel)

Am I missing something here?