The https://docs.openshift.com/container-platform/4.7/applications/application_life_cycle_management/odc-viewing-application-composition-using-topology-view.html#odc-labels-and-annotations-used-for-topology-view_viewing-application-composition-using-topology-view doc has a link to the labels doc by Gorkem. "For detailed information on the labels and annotations OpenShift Container Platform applications must use, see Guidelines for labels and annotations for OpenShift applications." It points to: https://github.com/gorkem/app-labels/blob/master/labels-annotation-for-openshift.adoc

That repo has moved under the RH developer repo. Update the link to point to: https://github.com/redhat-developer/app-labels/blob/master/labels-annotation-for-openshift.adoc