Ok I found it ... in the metadata of the node
event.getNodeInstance().getNode().getMetaData().get("Lane");
@Override
public void beforeNodeTriggered(ProcessNodeTriggeredEvent event) {
log.info("before node triggered " + event.getNodeInstance().getNodeName());
log.info(" in lane " + event.getNodeInstance().getNode().getMetaData().get("Lane"));
}