Kopia doesn't delete all the contents under the folder  ${bucket_name}/kopia/${namespace} on the s3 location after backup expiration.

Similar to the reported issues at,

• https://github.com/vmware-tanzu/velero/issues/6916 [1]
• https://github.com/vmware-tanzu/velero/issues/7716 [2]

As per [2] looks like even if all backups have been deleted is still required to run kind of kopia maintenance for deleting those.
Version-Release number of selected component (if applicable):
 - OADP 1.4.1 

Steps to Reproduce:
1. Run multiple incremental backups
2. Expire some backups
3. Review contents on the S3 backend

For OADP-1.4.2 this is still under investigation,  however we are planning on documenting what customers can expect when using uploaderType: kopia.

That documentation is being constructed here: https://hackmd.io/ZW2ptw-kRAm6iuUgfkWaaw

FYI rhn-support-anarnold  Myself, rhn-engineering-mpryc and sseago will get the docs team a draft.