docs: void sanityCheck() throws IllegalStateException {
          if (getStatus() != TimeInstrumentStatus.STOPPED) {
              throw new IllegalStateException("time instrument [" + getName() + " is not stopped");
          }
  
          long totalElapsed = globalStopWatch.elapsedTime();
          long childTotal = 0;
  
          for (TimeInstrument ti : childTimeInstrumentList) {
              childTotal += ti.elapsedTime();
              if (ti.getStatus() != TimeInstrumentStatus.STOPPED) {
                  throw new IllegalStateException("time instrument [" + ti.getName() + " is not stopped");
              }
              if (ti instanceof Profiler) {
                  Profiler nestedProfiler = (Profiler) ti;
                  nestedProfiler.sanityCheck();
              }
          }
          if (totalElapsed < childTotal) {
              throw new IllegalStateException("children have a higher accumulated elapsed time");
          }
      }