code: private static void appendLevel(StringBuilder message, LogRecord event)
      {
          final String logLevel = event.getLevel().getName();
          for (int i = logLevel.length(); i < LOG_LEVEL_LENGTH; i++)
          {
              message.append(Constant.SPACE);
          }
          message.append(logLevel).append(Constant.DOUBLE_DOT);
      }
docs: Append log level.
  
  @param message The message builder.
  @param event The log record.