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Amazon S3 now lets you attach multiple named annotations—structured JSON or plain text—directly to objects and manage them independently via the GetObjectAnnotation and ListObjectAnnotations APIs. This feature scales to petabytes, works across storage classes, and avoids separate metadata systems.
- S3 now supports multiple independently-managed named annotations (JSON or text) per object via new GetObjectAnnotation and ListObjectAnnotations APIs.
- Annotations are billed at standard S3 rates regardless of the parent object's storage class, so archiving to Glacier doesn't cut annotation costs.
- Designed to eliminate the need for a separate metadata database by keeping context like media specs, AI summaries, or compliance data attached directly to the object.