code: func CheckEvictionSupport(clientset kubernetes.Interface) (string, error) {
  	discoveryClient := clientset.Discovery()
  	groupList, err := discoveryClient.ServerGroups()
  	if err != nil {
  		return "", err
  	}
  	foundPolicyGroup := false
  	var policyGroupVersion string
  	for _, group := range groupList.Groups {
  		if group.Name == "policy" {
  			foundPolicyGroup = true
  			policyGroupVersion = group.PreferredVersion.GroupVersion
  			break
  		}
  	}
  	if !foundPolicyGroup {
  		return "", nil
  	}
  	resourceList, err := discoveryClient.ServerResourcesForGroupVersion("v1")
  	if err != nil {
  		return "", err
  	}
  	for _, resource := range resourceList.APIResources {
  		if resource.Name == EvictionSubresource && resource.Kind == EvictionKind {
  			return policyGroupVersion, nil
  		}
  	}
  	return "", nil
  }
docs: // CheckEvictionSupport uses Discovery API to find out if the server support
  // eviction subresource If support, it will return its groupVersion; Otherwise,
  // it will return an empty string