/**
  * Convert data in standard unit for metrics
  *
  * @param MetricInterface $metric
  */
 protected function createMetricBaseValues(MetricInterface $metric)
 {
     $baseUnit = $this->manager->getStandardUnitForFamily($metric->getFamily());
     if (is_numeric($metric->getData())) {
         $baseData = $this->converter->setFamily($metric->getFamily())->convertBaseToStandard($metric->getUnit(), $metric->getData());
     } else {
         $baseData = null;
     }
     $metric->setBaseData($baseData);
     $metric->setBaseUnit($baseUnit);
 }