code: def metric_delete(self, project, metric_name):
          
          path = "projects/%s/metrics/%s" % (project, metric_name)
          self._gapic_api.delete_log_metric(path)
docs: API call:  delete a metric resource.
  
          :type project: str
          :param project: ID of the project containing the metric.
  
          :type metric_name: str
          :param metric_name: the name of the metric