type GroupVersionRegistry interface {
	// IsGroupRegistered returns true if given group is registered.
	IsGroupRegistered(group string) bool
	// IsVersionRegistered returns true if given version is registered.
	IsVersionRegistered(v schema.GroupVersion) bool
	// PrioritizedVersionsAllGroups returns all registered group versions.
	PrioritizedVersionsAllGroups() []schema.GroupVersion
}

	for _, groupVersion := range groupVersions {
		if !scheme.IsVersionRegistered(groupVersion) {
			return nil, fmt.Errorf("webhook plugin requires enabling extension resource: %s", groupVersion)
		}
	}

	clientConfig := rest.CopyConfig(config)

	for _, observedVersion := range s.observedVersions {
		if observedVersion.Group == group {
			return true
		}
	}
	return false
}

// IsVersionRegistered returns true if types for the version have been registered with the scheme
func (s *Scheme) IsVersionRegistered(version schema.GroupVersion) bool {
	for _, observedVersion := range s.observedVersions {
		if observedVersion == version {
			return true
		}
	}

		if err != nil {
			return genericapiserver.APIGroupInfo{}, err
		}

		storage[resource] = controllerStorage.Controller
		storage[resource+"/status"] = controllerStorage.Status
		if legacyscheme.Scheme.IsVersionRegistered(schema.GroupVersion{Group: "autoscaling", Version: "v1"}) {
			storage[resource+"/scale"] = controllerStorage.Scale
		}
	}

	// potentially override generic storage for service account (with pod support)