@mngrif We are in fact running nginx + letsencrypt + docker with discovery. About as industry standard as you can. You basically just compile a docker container with pixel fed in it, point it to an external database (we have a few up already), set some variables ont he container and the proxy will automatically discover it, route to it, and generate a SSL certificate for it.
Aside from the automated discovery its defacto industry standard all the way.
To be clear I was using haproxy but the current re-design changes that to ngix. That component is mostly done and working just need to get the individual servers up now.