code: @EventListener(classes = TargetDeletedEvent.class)
      protected void targetDelete(final TargetDeletedEvent deleteEvent) {
          if (isNotFromSelf(deleteEvent)) {
              return;
          }
          sendDeleteMessage(deleteEvent.getTenant(), deleteEvent.getControllerId(), deleteEvent.getTargetAddress());
      }
docs: Method to send a message to a RabbitMQ Exchange after a Target was
  deleted.
  
  @param deleteEvent
  the TargetDeletedEvent which holds the necessary data for
  sending a target delete message.