code: def _build_path(self, path, metric_type):
          
          path = self._get_prefixes(metric_type) + list(path)
          return '{}.{}'.format(self._namespace,
                                '.'.join(str(p).replace('.', '-') for p in path))
docs: Return a normalized path.
  
          :param list path: elements of the metric path to record
          :param str metric_type: The metric type
          :rtype: str