Amazon S3 now appends AWS source region information automatically to each server access log entry, identifying from which AWS Region requests to a bucket originate. This enhancement helps users detect cross-region data access patterns potentially affecting latency and cost.
The feature requires no configuration and will roll out to all AWS Regions at no extra charge. For example, if an application in us-west-2 accesses data in a us-east-1 bucket, the logs record 'us-west-2' as the source region, enabling administrators to analyze and optimize regional data flow and related expenses.
Source & further reading
Amazon S3 now provides AWS source region information in server access logs ↗Source published 2026-02-23. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.