Moving to Ceph-Ansible as the issue happens during Ansible playbook run. I inspected the Ceph-Ansible code and it seems to support IPv6 addresses there. In ceph-dashboard Grafana is addressed by means of the whole URL (either IPv4, v6 or hostname)
Verified using ceph-ansible-4.0.6-1.el8cp.noarch ceph version 14.2.4-85.el8cp ansible-2.8.7-1.el8ae.noarch Moving to"VERIFIED" state
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:0312