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You can use AWS Cost Explorer and narrow down to the application making the 'ListObjects' API calls, provided you are using 'tags' effectively to identify different workloads/applications. From AWS Cost Explorer, select and filter by S3 service, next filter by 'ListBucket' API Operation from the drop down, and then in the last, in 'Group by' section, filter by 'Tag'.
Other option is you can use AWS CloudTrail Lake for your investigation. AWS CloudTrail Lake offers deeper and more customizable view of events.
You can also use AWS Cost and Usage Reports to dive deeper to identify spend at resource/API level.
answered 9 months ago
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