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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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Chez
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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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