Someone was trying to make a docker registry work for toolsbeta. This may be a very good thing for future k8s work. It is mentioned here where it was clearly never done: T190893. It was also probably started and not finished because of other work.

That said, it appears as if it will start working there as soon as it is given the TLS certs and some odd bit about prometheus is fixed (which appears to be related to ipmitool).