code: def metric_create(self, project, metric_name, filter_, description):
          
          parent = "projects/%s" % (project,)
          metric_pb = LogMetric(name=metric_name, filter=filter_, description=description)
          self._gapic_api.create_log_metric(parent, metric_pb)
docs: API call:  create a metric resource.
  
          See
          https://cloud.google.com/logging/docs/reference/v2/rest/v2/projects.metrics/create
  
          :type project: str
          :param project: ID of the project in which to create the metric.
  
          :type metric_name: str
          :param metric_name: the name of the metric
  
          :type filter_: str
          :param filter_: the advanced logs filter expression defining the
                          entries exported by the metric.
  
          :type description: str
          :param description: description of the metric.