We have recovered old tagged content from https://docs.openstack.org/developer/$project and moved them to https://docs.openstack.org/$project/$version. As part of this process, we also kept any builds from the tip of the mitaka, newton, and ocata branches using those names as $version. And finally, for the projects that have had no doc builds since we updated the output location of the documentation job, we moved their /developer/$project content over to /$project/latest. Big thanks to fungi for helping with the restoration! Doug