Comment 4 for bug 2024205

Reviewed: https://review.opendev.org/c/openstack/neutron/+/890393
Committed: https://opendev.org/openstack/neutron/commit/ebd19805b840f591fd47be452d541407efc428b2
Submitter: "Zuul (22348)"
Branch: stable/zed

commit ebd19805b840f591fd47be452d541407efc428b2
Author: Lucas Alvares Gomes <email address hidden>
Date: Fri Jun 16 13:44:07 2023 +0100

    [OVN] Hash Ring: Better handle Neutron worker failures

    This patch implements a more resilient approach to handle the case
    where Neutron API workers are killed and restarted. Instead of marking
    all nodes for that host as offline, this patch tries to remove the
    worker that was killed from the Hash Ring leaving all others nodes for
    that host online.

    In case the we fail to remove the node and another entry is added upon the
    restart of the worker this patch also logs a clear critical log message to
    alert the operator that there are more Hash Ring nodes than API workers
    (it's expect to be the same) and that OVSDB events could go missing if
    they are routed to the previous node that failed to be removed from the
    ring.

    Closes-Bug: #2024205
    Change-Id: I4b7376cf7df45fcc6e487970b068d06b4e74e319
    Signed-off-by: Lucas Alvares Gomes <email address hidden>
    (cherry picked from commit 9e8e3a7867b689ca1bd462ddff294db030032350)