Cloudwatch alarm not triggering when setpoint breached

Question

I have the following alarm:

```
"Expression": "(usage_data/SERVICE_QUOTA(usage_data))*100" 
Threshold: % Utilisation >= 10 for 1 datapoints within 10 minutes
Datapoints to alarm
1 out of 1
Missing data treatment
Treat missing data as missing
```
This does not appear to be triggering as expected. I expect the alarm to trigger if the Utilisation is greater than 10 for any datapoint in the last 10 minutes, however when it does breach the threshold, the alarm does not trigger.

![Enter image description here](/media/postImages/original/IMOpxkqG0lQCyRDQPod5Nu6A)

secondabhi_aws · Answer

Based on what you described, it seems you should set the alarm on "SUM". If you'd use "SUM", then as total number exceeds 10 in 10 minutes duration, alarm would go "In-alarm" state and it'd trigger the target.

Also, note that if alarm is in "In-alarm" state and utilization is still greater than or equal to 10, it won't trigger the target. To re-trigger the target, it has to come back again in "OK" or "Insufficient Data" state.

Check the settings at Additional configuration -> Datapoints to alarm. This might also be a problem in your case.

Hope you find this useful.

Abhishek

Jsc · Answer

Hi, can you please share the whole alarm definition? Are you alarming on average, min, max of the metric?

Cloudwatch alarm not triggering when setpoint breached

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