设置服务人员和客户界面登录屏幕的默认错误消息，在系统处于维护期时显示。

默认值:

--- We are performing scheduled maintenance. Login is temporarily not available.

设置服务人员和客户界面登录屏幕的默认消息，在系统处于维护期时显示。

默认值:

--- We are performing scheduled maintenance. We should be back online shortly.

设置系统处于维护期时显示通知的默认消息。

默认值:

--- We are performing scheduled maintenance.

设置在系统维护期多少分钟之前开始显示一个引起注意的通知。

默认值:

--- '30'