[Bug 1859649] Re: networking disruption on upgrade from 14.0.0 to 14.0.3

[Corey Bryant]

Agree that a minor semver bump would be good in this scenario. Thanks
for updating the checklist @Slawek.

This page in the charm deployment guide needs better guidance on upgrade
order:

https://docs.openstack.org/project-deploy-guide/charm-deployment-
guide/latest/app-upgrade-openstack.html#known-openstack-upgrade-issues

There is service-specific guidance at the following that should be
accounted for: https://docs.openstack.org/operations-guide/ops-
upgrades.html#service-specific-upgrade-instructions.

It says:
"In terms of the upgrade order, begin with ‘keystone’. After that, the rest of the charms can be upgraded in any order."

It also has nova-compute and neutron-gateway listed as a 3 in the
"Upgrade order" table.

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https://bugs.launchpad.net/bugs/1859649

Title:
  networking disruption on upgrade from 14.0.0 to 14.0.3

Status in OpenStack Charms Deployment Guide:
  New
Status in Ubuntu Cloud Archive:
  Incomplete
Status in neutron:
  Incomplete
Status in neutron package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  Not entirely sure why, but if a cloud has services running these 2
  versions of neutron (2:14.0.3-0ubuntu1~cloud0 and
  2:14.0.0-0ubuntu1.1~cloud0), networking is basically broken until
  everything is running 2:14.0.3-0ubuntu1~cloud0.

  Which causes networking disruption when not all nodes are upgraded at
  the same time.

  Thanks

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