Some initial work was done to move metadata management to the admin ui module for the reference application to end up with the links on this page: http://qa-refapp.openmrs.org/openmrs/adminui/metadata/configureMetadata.page. There is still some more functionality that needs to be moved over. The goal of this is to ensure that one can comfortably run the reference application without requiring the legacyui module for metadata management. You will see the management links for the legacy ui from http://qa-refapp.openmrs.org/openmrs/admin/index.htm
For the initial work done, you can take a look at these tickets.
We need to implement the following functionality in the adminui module:
Present Project Wiki: Admin UI Module
Github codebase: https://github.com/openmrs/openmrs-module-adminui
Project Tickets: https://issues.openmrs.org/browse/RA/
AdminUI Talk post: https://talk.openmrs.org/t/admin-ui-sprint-what-is-high-priority/2257
AdminUI sprint kick off meeting: