@Override
    protected void configure(FormField field) throws NotAcceptableException {
        if ("pubsub#persist_items".equals(field.getVariable())) {
            persistPublishedItems = parseFirstValueAsBoolean( field, true );
            Log.trace("Configuring {}: {}", field.getVariable(), persistPublishedItems);
        }
        else if ("pubsub#max_payload_size".equals(field.getVariable())) {
            maxPayloadSize = field.getFirstValue() != null ? Integer.parseInt( field.getFirstValue() ) : 5120;
            Log.trace("Configuring {}: {}", field.getVariable(), maxPayloadSize);
        }
        else if ("pubsub#send_item_subscribe".equals(field.getVariable())) {
            sendItemSubscribe = parseFirstValueAsBoolean( field, true );
            Log.trace("Configuring {}: {}", field.getVariable(), sendItemSubscribe);
        }
    }
The last item published to this node.  In a cluster this may have occurred on a different cluster node.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/LeafNode.java