At the moment I’m failing to work out where I can add it to the container nginx so that it’ll actually have an effect; the container’s access log is always reporting the same IP from every hit after each time I’ve tried adding it to a different block of the discourse nginx and restarting. the nginx docs suggest that module has to be built separately but I’m assuming it already is in your docker distribution?
Also, curious whether this has changed upstream semi-recently; as recently as Oct 10 (when I was probably not more than a month or so behind on updates) the Discourse site was able to identify external IPs other than localhost and report them properly, and our nginx configs haven’t changed in over a year.