1. Check whether the cluster already has the metrics‑server installed:

   kubectl get apiservice v1beta1.metrics.k8s.io

    

2. Check the available Helm Chart versions: 

   helm search repo spot

    

3. Update to the latest Helm Chart version.

4. If the upgrade still fails, add the following flag to your helm upgrade --install command:

   --set metrics-server.deloyChart=false

   
   This prevents Helm from attempting to deploy a metrics‑server chart that may already exist in the cluster or conflict with your current installation.

After completing these steps, the Helm upgrade should complete successfully without the template parsing error.