Sysupgrade Server Stats page runs into redirect error

The Sysupgrade Server Stats page https://sysupgrade.openwrt.org/stats/ results in "This page isn’t redirecting properly" (NS_ERROR_REDIRECT_LOOP)

Is something broken in the config or is this service taken offline?

Yep you are absolutely correct, it is redirect-looping.

~# curl -v https://sysupgrade.openwrt.org/stats/login
* Connected to sysupgrade.openwrt.org port 443

> GET /stats/login HTTP/2
> Host: sysupgrade.openwrt.org

< HTTP/2 302 
< location: /stats/login
< server: Caddy