Understand AWS CloudWatch metrics and Datadog measurements

A customer noticed a discrepancy between network metrics reported by Datadog and AWS CloudWatch, with Datadog's values appearing off by a factor of 2. The issue was resolved by normalizing the timeseries data across different collection intervals and scoping collected data for accurate comparison. It was discovered that system.net.bytes_rcvd had an additional dimension (device) not present in CloudWatch, resulting in differing metric calculations. By adjusting the query to include the same network interface as CloudWatch, comparable values were obtained. This highlights the importance of using tags as query dimensions for comparison when dealing with similar but slightly different values reported from various sources.

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