Ceph » rgw

from here: https://docs.aws.amazon.com/AmazonS3/latest/userguide/notification-how-to-event-types-and-destinations.html

we should add the following types:
s3:ObjectRestore:*
s3:ObjectRestore:Post
s3:ObjectRestore:Completed
s3:ObjectRestore:Delete

By using the ObjectRestore event types, you can receive notifications for event initiation and completion when restoring objects from the S3 Glacier Flexible Retrieval storage class, S3 Glacier Deep Archive storage class, S3 Intelligent-Tiering Archive Access tier, and S3 Intelligent-Tiering Deep Archive Access tier. You can also receive notifications for when the restored copy of an object expires.
The s3:ObjectRestore:Post event type notifies you of object restoration initiation. The s3:ObjectRestore:Completed event type notifies you of restoration completion. The s3:ObjectRestore:Delete event type notifies you when the temporary copy of a restored object expires.

this could be done similarly to how sync notifications are done. see: https://github.com/ceph/ceph/blob/main/src/rgw/driver/rados/rgw_cr_rados.cc#L720