Avoiding INSUFFICIENT DATA in Cloudwatch?

Question

I have alarms set up to tell me when my load balancers are throwing 5xxs using the HTTPCode_Backend_5XX metric with the sum statistic. The issue is

Answer 1

As of March 2017, you can treat missing data as acceptable. This will prevent the alarm from being marked as INSUFFICIENT.

You can also set this in CloudFormation using the TreatMissingData property.