Hi, Matej,

What you have done above is more akin to "blue/green" deployment and not a true rolling upgrade.
True rolling upgrade would upgrade nodes in a cluster, one by one, and not in "groups".
This will allow to efficiently utilize all nodes and not lose computing capacity while the upgrade is in progress.
For this to be supported, two apps with two different names have to be deployed in the same "group" and enabled one by one. This is what the patch allows you to do.