feat: add plugin to scale daemonsets. #3788
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By default, k8s DaemonSets cannot be directly scaled down using e.g.
kubectl scale, because it is only intended to resize Deployment, ReplicaSet or Replication Controller.This PR implements a pretty popular workaround from stackoverflow, which adds the artificial nodeSelector (
"scaled-down=true") to the template.I implemented it without any dependencies based on
kubectl patch--type=merge/RFC7386.Since
nodeSelectoris map, this patch strategy will merge at the key-level and allows to add our additional key without replacing any existing ones.