@Override
    public void memberLeft(ClientMembershipEvent event) {
      Notification notification = new Notification(CLIENT_LEFT, serverSource,
          SequenceNumber.next(), System.currentTimeMillis(),
          CLIENT_LEFT_PREFIX + event.getMemberId());

      serverLevelNotificationEmitter.sendNotification(notification);
      memberLevelNotificationEmitter.sendNotification(notification);
    }
Invoked when a client has gracefully disconnected from this process or when this process has
gracefully disconnected from a CacheServer.
geode-core/src/main/java/org/apache/geode/management/internal/beans/ManagementAdapter.java