code: def publish_metric(self, metric_name, metric_value, epoch_seconds=None):
          '''Record a single hit on a given metric.
  
          Args:
              metric_name: The name of the metric to record with Carbon.
              metric_value: The value to record with Carbon.
              epoch_seconds: Optionally specify the time for the metric hit.
  
          Returns:
              None
  
          '''
          if epoch_seconds is None:
              epoch_seconds = self._reactor.seconds()
          self._client_factory.publish_metric(metric_name, metric_value, int(epoch_seconds)f publish_metric(self, metric_name, metric_value, epoch_seconds=None):
          '''Record a single hit on a given metric.
  
          Args:
              metric_name: The name of the metric to record with Carbon.
              metric_value: The value to record with Carbon.
              epoch_seconds: Optionally specify the time for the metric hit.
  
          Returns:
              None
  
          '''
          if epoch_seconds is None:
              epoch_seconds = self._reactor.seconds()
          self._client_factory.publish_metric(metric_name, metric_value, int(epoch_seconds))
docs: Record a single hit on a given metric.
  
          Args:
              metric_name: The name of the metric to record with Carbon.
              metric_value: The value to record with Carbon.
              epoch_seconds: Optionally specify the time for the metric hit.
  
          Returns:
              None