The Nginx 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 Nginx service status. If you use Checker and Autostart services, the Nginx Stats page must be configured

Roxy-WI improves the Nginx Stats pages and collects everything in one place.

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

Go to the Servers -> Settings. Edit settings inside the "Nginx section" according to your server stats configuration(in the black box)

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 Nginx service has not been installed via Roxy-WI, Nginx Stats page should be checked. If the "server stats" does not exist, you should configure Nginx service for working with Roxy-WI.

The detailed instruction can be found here