docs: public FileAppender<ILoggingEvent> configureGlobalFileLog(Props props, RootLoggerConfig config, String logPattern) {
      LoggerContext ctx = getRootContext();
      Logger rootLogger = ctx.getLogger(ROOT_LOGGER_NAME);
      FileAppender<ILoggingEvent> fileAppender = newFileAppender(ctx, props, config, logPattern);
      rootLogger.addAppender(fileAppender);
      return fileAppender;
    }