docs: public synchronized boolean isHealthy()
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "isHealthy");
  
          boolean retval = _running && !_stopRequested && (_threadWriteErrorsOutstanding == 0);
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "isHealthy", Boolean.valueOf(retval));
          return retval;
      }