New nodes kubestage100 have been handed over by DC-Ops and need to be setup/added do the cluster.
These are replacements for kubestage100, so those need to be decommissioned afterwards.
I don't think we have a proper documentation on how to do that (in Kubernetes context). That should be an outcome of this as well.
We actually had a bit of documentation from the "Create a new Cluster" perspective. I moved that out and extended it a bit (but I might not have caught every step/aspect): https://wikitech.wikimedia.org/wiki/Kubernetes/Clusters/Add_or_remove_nodes
After this is done, we should remote the workaround for mediawiki images in CI: T284628