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The Kubernetes docs say that all kubelet CLI flags are deprecated, but that is the only way to configure those options with k3s. Just use them anyway.

@creamy-pencil-82913 Can't you just point path to

KubeControllerManagerConfiguration

with required config. I'm pretty sure there is flag on each (vanilla) k8s cluster component that points to such file (although I can't find it now in the docs). Or maybe this flag has been removed/disabled in k3s on purpose?