[1] gives description about how to prepare ConfigMap CR to enable access to mirror registry. The explanation and example given, however, are not sufficient and there are some key information missing. User may find difficult to prepare ConfigMap CR that works.

[1] https://docs.openshift.com/container-platform/4.13/scalability_and_performance/ztp_far_edge/ztp-preparing-the-hub-cluster.html#ztp-configuring-the-cluster-for-a-disconnected-environment_ztp-preparing-the-hub-cluster

Since it is a document issue, it is always there.

N/A (Since it is a document issue, it is always there)

[2] Gives more detailed information and accurate than [1].

[2] https://github.com/openshift/assisted-service/blob/master/docs/operator.md#mirror-registry-configuration