Understanding the AWS bill is far harder than it should be. That being said, there are some resources that weren't mentioned in this blog post. The ultimate sou

Understanding the AWS bill is far harder than it should be. That being said, there are some resources that weren't mentioned in this blog post. The ultimate source of truth is the AWS Cost & Usage Report [1] which can be delivered in Parquet and queried with SQL via Athena. Although the Cost & Usage Report alone can solve many billing mysteries, in some cases it's also necessary to go to CloudTrail logs to determine exactly which user or application incurred charges. [1] https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/billing-reports-costusage.html https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2...