docs: public String messageLogFormat(LogRecord logRecord, String formattedVerboseMsg) {
          // This is a very light trace format, based on enhanced:
          StringBuilder sb = new StringBuilder(256);
          String sym = getMarker(logRecord);
          String name = nonNullString(logRecord.getLoggerName(), logRecord.getSourceClassName());
  
          sb.append('[').append(DateFormatHelper.formatTime(logRecord.getMillis(), useIsoDateFormat)).append("] ");
          sb.append(DataFormatHelper.getThreadId()).append(' ');
          formatFixedString(sb, name, enhancedNameLength);
          sb.append(sym); // sym has built-in padding
          sb.append(formattedVerboseMsg);
  
          if (logRecord.getThrown() != null) {
              String stackTrace = getStackTrace(logRecord);
              if (stackTrace != null)
                  sb.append(LoggingConstants.nl).append(stackTrace);
          }
  
          return sb.toString();
      }