Duplicate *-delete files will be created after a GC run on each node of an HA cluster when the cluster-s3 template (or similiar is used) for the binarystore.xml.
1. Setup HA with Eventual Binary Provider.
2. Watch the eventual/_queue folder of each node.
3. Delete artifacts from Artifactory and run the GC
Duplicate -delete marker files will be seen in the _queue folders
Example in the screenshot. Each side lists _queue folder content of each node.