code: func NewMetricConverter() *MetricConverter {
  	return &MetricConverter{
  		scheme: scheme.Scheme,
  		codecs: serializer.NewCodecFactory(scheme.Scheme),
  		internalVersioner: runtime.NewMultiGroupVersioner(
  			scheme.SchemeGroupVersion,
  			schema.GroupKind{Group: cmint.GroupName, Kind: ""},
  			schema.GroupKind{Group: cmv1beta1.GroupName, Kind: ""},
  			schema.GroupKind{Group: cmv1beta2.GroupName, Kind: ""},
  		),
  	}
  }
docs: // NewMetricConverter creates a MetricConverter which knows how to convert objects
  // between different versions of the custom metrics api.