public function addMetric(OrderOnCreatedEvent $event)
{
$storeTracker = $this->store->getTracker();
$this->metricManager->addEntry($storeTracker, 'order_nb', '0', ElcodiMetricTypes::TYPE_BEACON_ALL, new DateTime());
$orderAmount = $event->getOrder()->getAmount()->getAmount();
$this->metricManager->addEntry($storeTracker, 'order_total', $orderAmount, ElcodiMetricTypes::TYPE_ACCUMULATED, new DateTime());
}