public function closeAction(Incident $incident)
 {
     $this->assertUserRights(UserRole::ROLE_COLLABORATOR, $incident->getEventIdentifier()->getProject());
     $eventIdentifier = $incident->getEventIdentifier();
     $closeEvent = new Event();
     $closeEvent->setEventIdentifier($eventIdentifier);
     $closeEvent->setSystem($eventIdentifier->getSystem()->getIdentifier());
     $closeEvent->setStatus(Event::STATUS_SUCCESS);
     $closeEvent->setIsStatusChange(true);
     $closeEvent->setUnique($eventIdentifier->getLastEvent()->isUnique());
     $closeEvent->setType($eventIdentifier->getLastEvent()->getType());
     $closeEvent->setComponentId($eventIdentifier->getLastEvent()->getComponentId());
     $closeEvent->setMessage('Manually closed by ' . $this->getUser()->getUsername() . '.');
     if (!$incident->getAcknowledgedBy()) {
         $incident->setAcknowledgedBy($this->getUser());
     }
     $em = $this->getDoctrine()->getManager();
     $em->persist($incident);
     $em->flush();
     $this->get('koalamon.project.helper')->addEvent($closeEvent);
     return new JsonResponse(['status' => 'success', 'message' => 'The incident was closed successfully.', 'event_identifier_id' => $eventIdentifier->getId()]);
 }