Why doesn't the Kubernetes dashboard display utilization graphs?

When you access the Kubernetes dashboard, utilization graphs don't display.

Sometimes after a cluster update or worker node reboot, the kubernetes-dashboard pod does not update, or the metrics-server is not running properly.

Follow these steps to resolve the issue:

1. Verify that the metrics-server is running in your cluster.

   kubectl get deployment metrics-server -n kube-system
   

2. If the metrics-server is not running or is in a failed state, check the pod logs.

   kubectl logs -n kube-system -l k8s-app=metrics-server
   

3. Delete the kubernetes-dashboard pod to force a restart. The pod is re-created with RBAC policies to access the metrics-server for utilization information.

   kubectl delete pod -n kube-system $(kubectl get pod -n kube-system --selector=k8s-app=kubernetes-dashboard -o jsonpath='{.items..metadata.name}')
   

4. If the issue persists, restart the metrics-server deployment.

   kubectl rollout restart deployment metrics-server -n kube-system