The Apache Stats page does not provide so much information as HAProxy. It can be useful only for getting basic statics. But Checker and Autostart services use the Stats page for checking Apache service status. If you use Checker and Autostart services, the Apache Stats page must be configured

If Apache service has not been installed via Roxy-WI, Apache Stats page should be checked.

Go to the Servers -> Settings. Edit settings inside the "Apache section" according to your server stats configuration

Note: Be aware that these settings will influence only the servers inside your current group. If you would like to change the setting for other groups, change your current group and repeat the steps described above.

If Apache service has not been installed via Roxy-WI, should be Apache Stats page should be checked.

The detailed instruction can be found here