How do I send an alert in an FKM sampler if there are 3 trigger keys detected within 1 minute?

You can use the rate function in a rule.

1. Set the FKM sampler sampling time to 60 seconds.
2. Set the FKM sampler trigger mode to "Multiple" and set a triggerCount column.
3. Ensure that the Trigger count mode is set to "sum" (by default)
4. Set a rule against the trigger count column:

if rate(value) * 60 > 2 then severity critical run "alert" else severity ok endif

NOTE: if sampleNow is triggered, it can affect the accuracy of the rate computation

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How do I send an alert in an FKM sampler if there are 3 trigger keys detected within 1 minute?

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