code: public synchronized void remoteClientRegistrations(RESTRequest request) {
          Iterator<Entry<NotificationTargetInformation, ClientNotificationListener>> clientListeners = listeners.entrySet().iterator();
  
          try {
              while (clientListeners.hasNext()) {
                  Entry<NotificationTargetInformation, ClientNotificationListener> clientListener = clientListeners.next();
                  NotificationTargetInformation nti = clientListener.getKey();
                  ClientNotificationListener listener = clientListener.getValue();
  
                  // Check whether the producer of the notification is local or remote.
                  if (nti.getRoutingInformation() == null) {
                      // Remove the notification from the MBeanServer
                      ObjectName objName = RESTHelper.objectNameConverter(nti.getNameAsString(), false, null);
  
                      if (MBeanServerHelper.isRegistered(objName)) {
                          try {
                              MBeanServerHelper.removeClientNotification(objName, listener);
                          } catch (RESTHandlerJsonException exception) {
                              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                                  Tr.debug(tc, "Received exception while cleaning up: " + exception);
                              }
                          }
                      }
                      else {
                          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                              Tr.debug(tc, "The MBean " + objName + " is not registered with the MBean server.");
                          }
                      }
                  } else {
                      // Remove the notification listener from the Target-Client Manager through EventAdmin
                      MBeanRoutedNotificationHelper helper = MBeanRoutedNotificationHelper.getMBeanRoutedNotificationHelper();
                      helper.removeRoutedNotificationListener(nti, listener);
                  }
              }
          } finally {
              //Clear the map
              listeners.clear();
          }
      }
docs: Remove all the client notifications