code: def is_gauge(md_type):
      
      if md_type not in metric_descriptor.MetricDescriptorType:
          raise ValueError  # pragma: NO COVER
  
      return md_type in {
          metric_descriptor.MetricDescriptorType.GAUGE_INT64,
          metric_descriptor.MetricDescriptorType.GAUGE_DOUBLE,
          metric_descriptor.MetricDescriptorType.GAUGE_DISTRIBUTION
      }
docs: Whether a given MetricDescriptorType value is a gauge.
  
      :type md_type: int
      :param md_type: A MetricDescriptorType enum value.