How to set metric-server imagepullpolicy value in rke-config

All installations are normal, except for Metrics - Server reminding me to mirror Err pull. But the local is mirrored. From the kbuectl get deploy -n kube-system, it can be found that the value of the image imagepullPolicy of the metric-Server is ALWAYS.[Question] How do I set it to be IfNotPresent or Never in RKE’s configuration file cluster.yml? thank you

provider: none

what‘s other?? for imagepullpolicy?