code: func (r Metric_Tracking_Object) GetSummaryData(startDateTime *datatypes.Time, endDateTime *datatypes.Time, validTypes []datatypes.Container_Metric_Data_Type, summaryPeriod *int) (resp []datatypes.Metric_Tracking_Object_Data, err error) {
  	params := []interface{}{
  		startDateTime,
  		endDateTime,
  		validTypes,
  		summaryPeriod,
  	}
  	err = r.Session.DoRequest("SoftLayer_Metric_Tracking_Object", "getSummaryData", params, &r.Options, &resp)
  	return
  }
docs: // Returns summarized metric data for the date range, metric type and summary period provided.