Comment 1 for bug 1959837

Reviewed: https://review.opendev.org/c/openstack/charm-ceph-radosgw/+/848739
Committed: https://opendev.org/openstack/charm-ceph-radosgw/commit/44fee84d4d61e8ccda78dfb9afd68e0048686d4a
Submitter: "Zuul (22348)"
Branch: master

commit 44fee84d4d61e8ccda78dfb9afd68e0048686d4a
Author: utkarshbhatthere <email address hidden>
Date: Tue Jul 5 17:27:36 2022 +0530

    Adds support for migration to multi-site system.

    1.) Currently multi-site can only be configured when system is being
    deployed from scratch, migration works by renaming the existing
    Zone/Zonegroups (Z/ZG) to Juju config values on primary site before
    secondary site pulls the realm data and then rename and configure
    secondary Zone accordingly.

    During migration:
    2.) If multiple Z/ZG not matching the config values are present at
    primary site, the leader unit will block and prompt use of
    'force-enable-multisite' which renames and configures selected Z/ZG
    according to multisite config values.

    3.) If the site being added as a secondary already contain Buckets,
    the unit will block and prompt the operator to purge all such Buckets
    before proceeding.

    Closes-Bug: #1959837
    Change-Id: I01a4c1c4551c797f0a32951dfbde8a1a4126c2d6
    func-test-pr: https://github.com/openstack-charmers/zaza-openstack-tests/pull/840