Metrics reporting with "N/A" AWS host tags

In some scenarios you may observe metrics grouped by an AWS host tag occasionally output a value as N/A. For example, in the below the metric aws.ec2.cpuutilization is showing a unique time series for instance-type:N/A:

Why does this happen?

The Datadog AWS Integration use two separate crawlers to retrieve data from AWS CloudWatch - one that fetches the host tags and another that collects the metrics. Therefore, in cases when the AWS metrics crawler runs before the tags crawler for newly added hosts, we momentarily get metrics that have no associated host tags, i.e. host tag values that are N/A. Eventually we do get the tags once the tags crawler runs, but at that point there are already time series created without these tags.

Engineering is working on adding a proper solution for this. 

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