code: func (sink *influxdbSink) metricToSeriesAndField(metricName string) (string, string) {
  	if sink.c.WithFields {
  		seriesName := strings.SplitN(metricName, "/", 2)
  		if len(seriesName) > 1 {
  			return seriesName[0], seriesName[1]
  		} else {
  			return seriesName[0], "value"
  		}
  	} else {
  		return metricName, "value"
  	}
  }
docs: // metricToSeriesAndField retrieves the appropriate field name and series name for a given metric
  // (this varies depending on whether or not WithFields is enabled)