code: func (r Metric_Tracking_Object) GetSummary(graphType *string) (resp datatypes.Container_Metric_Tracking_Object_Summary, err error) {
  	params := []interface{}{
  		graphType,
  	}
  	err = r.Session.DoRequest("SoftLayer_Metric_Tracking_Object", "getSummary", params, &r.Options, &resp)
  	return
  }
docs: // Retrieve a metric summary. Ideal if you want to employ your own graphing systems.  Note not all metric types contain a summary.  These return null.