private static void lazyTrace(Query query, int level, Object... args) {
        if (query.getTrace().isTraceable(level)) {
            StringBuilder s = new StringBuilder();
            for (Object arg : args) {
                s.append(arg);
            }
            query.trace(s.toString(), level);
        }
    }
The route to the storage cluster.
container-search/src/main/java/com/yahoo/vespa/streamingvisitors/StreamingBackend.java