I noticed that nginx statistics only display http hosts, using https://github.com/vozlt/nginx-module-vts .
There is also https://github.com/vozlt/nginx-module-sts , for stream statistics, which would be neat.
Otoh, both of those projects don't seem to be active anymore.
STS is not supported by the FreeBSD package build:
https://github.com/opnsense/ports/blob/master/www/nginx/Makefile
The status page is not available externally. It is passed thou to the OPNsense gui via an Unix socket.
Ah, I see, they only pulled in vts.