PromQL prolong alert 30 minutes

[fiala...@gmail.com]

Hi,

I have a simple rule for monitoring traffic drop (by 20% in last 15 minutes):

some_traffic_metric < (some_traffic_metric offset 15m * 0.8)

I need this alert to be active for at least 30 minutes. 

Please help, how to rewrite the query.

Thank you.

[Matthias Rampke]

Try `min_over_time` on a subquery:

min_over_time(( some_traffic_metric / some_traffic_metrics offset 15m)[30m:]) < 0.8

/MR

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