Comment 2 for bug 2055030

Reviewed: https://review.opendev.org/c/starlingx/distcloud/+/910150
Committed: https://opendev.org/starlingx/distcloud/commit/26bb7011e4e51f5b5ba728d08b214a197a50d583
Submitter: "Zuul (22348)"
Branch: master

commit 26bb7011e4e51f5b5ba728d08b214a197a50d583
Author: Zhang Rong(Jon) <email address hidden>
Date: Mon Feb 26 16:57:27 2024 +0800

    Fix issues with PGA sync_status

    This commit addresses the issue where the primary site's PGA status
    remains 'in-sync' even after the secondary site becomes unreachable.
    With this fix, the PGA status will be updated to 'unknown' upon the
    secondary site's failure. Additionally, the status will transition to
    'in-sync' once the secondary site is operational again.
    If there are any changes in the association while the secondary site is
    down, the PGA status will be set to failed. The sync status will
    transition to "out-of-sync" upon secondary site recovery.

    In this commit, the audit thread in the primary site will also update
    PGA sync_status. If the primary site is down and the SPG is migrated to
    secondary site, upon primary site recovery, its audit thread will update
    the PGA sync_status on both sites accordingly.

    Finally, the commit prevents the peergroup to from being updated in the
    secondary site.

    Test Case:
    1. PASS - Shutdown of site2 (secondary site) results in the
            synchronization status of the peer group association
            transitioning from 'in-sync' to 'unknown'.
    2. PASS - Restoration of site2 (secondary site) leads to the
            synchronization status of the peer group association on
            the primary site changing to 'in-sync', and the peer
            group association status on site2 also reflects 'in-sync'.
    3. PASS - While secondary is is offline, execute some operations which
            result in PGA sync_status being set to "failed". Recover
            secondary site and verify that the PGA sync_status is set to
            out-of-sync on both sites.
    4. PASS - Verify that updating peer group on secondary site is
            disallowed.
    5. PASS - Shut down the primary site, migrate the SPG to secondary site.
            Restore the primary site while migration is in progress. Verify
            that the PGA sync_status is out-of-sync. Verify that PGA
            sync_status is set to in-sync shortly after the migration is
            complete.

    Closes-Bug: 2055030

    Change-Id: I67f4200118621205c539b24eb764e3cc5acf12c0
    Signed-off-by: Zhang Rong(Jon) <email address hidden>