Errors Alert Policy never triggered

I have created an alert policy for my application.

Event: Errors/all
Triggered: number of events > 1 over 5 minu

See screenshot below:

I can see my application returned a few 500 errors in the past 30 mins. But no alert is triggered.

Help please.

Hi @george23, thanks for letting us know. Can I ask, did at least 2 errors occur within 5 minutes of that 30 minute stretch?

Yes, please find screenshot below:

As you can see, in the past 30 mins, 2x 500 errors are present. However, I did not get any alert.