@Override
    public void leftCluster(byte[] nodeID) {
        // Another node left the cluster.

        // Clean up directed presences sent from entities hosted in the leaving node to local entities
        // Clean up directed presences sent to entities hosted in the leaving node from local entities
        cleanupDirectedPresences(NodeID.getInstance(nodeID));
    }
Checks if the packet is a presence stanza that intends to reflect an update back to the client from which the update originated.

@param packet The stanza (cannot be null.
@return true if the packet is presence reflection, otherwise false.
xmppserver/src/main/java/org/jivesoftware/openfire/handler/PresenceUpdateHandler.java