OpenStack upgrades

Planning OpenStack release upgrades under the SLURP cadence, including skip-level upgrades and the upgrade workflow of the Kolla-Ansible deployment tool.

OpenStack upgrades with Kolla-Ansible

The Kolla-Ansible upgrade runbook for containerized clouds: configuration backup and merge, prechecks, image pulls, the RabbitMQ one-major-version rule and why partial upgrades with --limit are avoided.

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