code: func (r Metric_Tracking_Object) GetCustomGraphData(graphContainer *datatypes.Container_Graph) (resp datatypes.Container_Graph, err error) {
  	params := []interface{}{
  		graphContainer,
  	}
  	err = r.Session.DoRequest("SoftLayer_Metric_Tracking_Object", "getCustomGraphData", params, &r.Options, &resp)
  	return
  }
docs: // Returns a graph container instance that is populated with metric data for the tracking object.