> i checked prometheus , alertmanager and webhook logs too.

And what did you see in those logs?

What does the complete alerting rule look like? (Not just the "expr:" but 
other things like "for:")

You need to identify:
- did prometheus identify an alert condition, and send it to alertmanager?
- did alertmanager receive the alert?
- did alertmanager send the webhook?
- was the webhook up and able to receive the notification?


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