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The layout of the form differs for RKE1 vs RKE2/K3s. It doesn't have the tab if it's an RKE1 cluster, however it should still be possible to configure the max unavailable nodes for RKE1

yes... I have discovered through trials and tribulations that I'm on RKE1. I am fixing a few things up with that realization which is, in effect, making other things easier and more in-line to what I expect and what I see in the latest documentation. Thanks Catherine (yet again!) 😄