code: func (r Virtual_Guest) GetCpuMetricImageByDate(startDateTime *datatypes.Time, endDateTime *datatypes.Time, cpuIndexes []int) (resp datatypes.Container_Bandwidth_GraphOutputs, err error) {
  	params := []interface{}{
  		startDateTime,
  		endDateTime,
  		cpuIndexes,
  	}
  	err = r.Session.DoRequest("SoftLayer_Virtual_Guest", "getCpuMetricImageByDate", params, &r.Options, &resp)
  	return
  }
docs: // Use this method when needing a CPU usage image for a single guest.  It will gather the correct input parameters for the generic graphing utility based on the date ranges