Volume-stats-agg-period and housekeeping-interval and other kubelet options

k3s v1.23.9+k3s1

I have set the following:

ExecStart=/usr/local/bin/k3s server \
  --write-kubeconfig-mode 664 \
  --disable traefik --disable metrics-server \
  --docker \
  --cluster-cidr 10.242.0.0/16 --service-cidr 10.243.0.0/16 --cluster-dns 10.243.0.10 \
  --kube-controller-arg=terminated-pod-gc-threshold=100 \
  --kubelet-arg=image-gc-high-threshold=100 \
  --kubelet-arg=cpu-cfs-quota=true \
  --kubelet-arg=volume-stats-agg-period=10m \
  --kubelet-arg=housekeeping-interval=30s \
  --node-name mediakind \
  --flannel-iface tap0

I get no errors and k3s works. My question is how do I know that

  --kubelet-arg=volume-stats-agg-period=10m
  --kubelet-arg=housekeeping-interval=30s

are actually applied and making any difference?

And are they supported options?