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Re:Google Kubernetes Engine is introducing a cluster managem... by bgracely on Wednesday March 04, 2020 @07:28PM (#22489749)
There is a free tool to help with migrations from OpenShift 3.x to 4.x - https://access.redhat.com/documentation/en-us/openshift_cont...

It's not a rolling upgrade, but it allows you to move the apps, PVs, policies in as granular a manner as you wish.

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