Found in DR4 as the first release which contains Infinispan 6.0.0.Aplha4 and therefore REST Cache Store + possibility of REST Rolling Upgrades.

I've experienced problems with starting JDG node using standalone-rest-rolling-upgrade.xml example configuration (for target node).

Please see report in attachment.
You can find 2 console outputs of jdg server. The second one is after some changes in modules.xml (in rest cachestore module).

Details are shown and described in that file.