public static Trace createNew(int traceLevel, Clock clock) {
        return new Trace(traceLevel, new TraceNode(null, clock.millis()), clock);
    }
A trace utility that can serialize/deserialize to/from {@link Slime}

@author Ulf Lilleengen
config/src/main/java/com/yahoo/vespa/config/protocol/Trace.java