code: private function tryDispatch($eventName, MetaModelsBootEvent $event)
      {
          $dispatcher = System::getContainer()->get('event_dispatcher');
          if ($dispatcher->hasListeners($eventName)) {
              // @codingStandardsIgnoreStart
              @trigger_error('Event "' . $eventName . '" has been deprecated - Use registered services.', E_USER_DEPRECATED);
              // @codingStandardsIgnoreEnd
              $dispatcher->dispatch($eventName, $event);
          }
      }
docs: Test if the event must get dispatched, if so, trigger deprecation and dispatch then.
  
  @param string              $eventName The event name.
  @param MetaModelsBootEvent $event     The event payload.
  
  @return void