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With Cloudwatch alarms I want to know about ALARM -> OK transition, but INSUFFICIENT_DATA -> OK transition just gets really annoying.

Is there a way to stop the latter notification? I could do via an email filter but would rather stop it at the source if possible.

imcdnzl
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2 Answers2

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Sadly, the answer appears to be:

Currently, this isn't possible though it is an interesting request.

from this forum answer on the 21st of January 2013:

https://forums.aws.amazon.com/thread.jspa?messageID=417727

Andy Hayden
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Jamie McCrindle
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In 2018 AWS launched metric math. Since that the problem could be solved with FILL() function. The function replaces empty (INSUFFICIENT_DATA) points with constant values.

CW metric example screenshot

m1 is a raw CloudWatch metric which contains holes in the time series.
e1 is a math metric and has zeros instead of empty points.

Using Metric Math:
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/using-metric-math.html

Detailed explanation how to create a metric math alarms:
https://aws.amazon.com/blogs/mt/create-a-metric-math-alarm-using-amazon-cloudwatch/

The similar question:
AWS Cloudwatch Math Expressions: removing Insufficient Data: is there a "coalesce" function like SQL?

Ivan Onushkin
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  • the FILL function must be specified in uppercase ! Even in Terraform. eg expression = "FILL(m2, 0) - FILL(m1,0)" – MikeW Feb 02 '21 at 09:54