public Profiler startNested(String name) {
        stopLastTimeInstrument();
        Profiler nestedProfiler = new Profiler(name);
        nestedProfiler.registerWith(profilerRegistry);
        nestedProfiler.setLogger(logger);
        childTimeInstrumentList.add(nestedProfiler);
        return nestedProfiler;
    }
Starts a child stop watch and stops any previously started time
instruments.
slf4j-ext/src/main/java/org/slf4j/profiler/Profiler.java