Kubernetes Cluster Collector Container Metrics: No data

For k3s you have to add an extra option to the cadviser container args so that it can find the countainerd socket.

kubectl -n checkmk-monitoring edit daemonsets.apps checkmk-node-collector-container-metrics
...
  containers:
  - args:
  ...
    - --storage_duration=1m0s
    - --containerd=/run/k3s/containerd/containerd.sock

last line is the one to add