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Merge "Define testing runtime for 2025.1 release"

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.. _2025-1-testing-runtime:
==========================
Tested Runtimes for 2025.1
==========================
Linux Distribution
==================
At the start of the 2025.1 development cycle, the current :ref:`LTS or stable
distribution <pti-linux-distros>` versions are:
* Ubuntu 24.04
* Debian 12
Additional testing for a smooth upgrade
---------------------------------------
* Ubuntu 22.04 (Supported in previous SLURP release 2024.1)
Expectation is to have at least one tempest job testing the Ubuntu 22.04 so
that the SLURP release upgrade (from 2024.1 to 2025.1) works fine.
Python
======
It is the :doc:`policy <../../resolutions/20181024-python-update-process>` that
each OpenStack release cycle will target the latest available version of
Python; default Python runtime on the distributions listed above; and versions
used in integration tests at the start of the cycle, at least until the point
when all projects have migrated to a later version.
Also, as per the Python testing requirements defined in :ref:`pti-python`,
projects should avoid removing Python versions that have not reached EOL
without a solid reason.
Based on the criteria above, all Python-based projects must target and test
against, at a minimum:
* Python 3.9 (available as default in Rocky Linux 9)
Python 3.9 is the the minimum supported/required version for 2025.1.
This does not imply that Debian 11 is the minimum supported distribution
but it may be used for tox testing. supporting Python 3.9 does not require
full tempest testing, but py39 unit tests are expected as a minimum
requirement for all Python projects. The minimal requirement for
testing jobs against Python versions above is to ensure language compatibility,
having more extensive testing is allowed.
* Python 3.10 (available as default in Ubuntu 22.04)
In previous cycle testing, we have not seen many incompatible changes between
Python 3.9 and Python 3.10. It is okay to skip running the Python 3.10 testing
jobs assuming that anything that works on Python 3.9 and 3.12 will also
work on 3.10. Periodic testing should be enough for this.
* Python 3.11 (available as default in Debian 12)
In previous cycle testing, we have not seen many incompatible changes between
Python 3.9 and Python 3.11. It is okay to skip running the Python 3.11 testing
jobs assuming that anything that works on Python 3.9 and 3.12 will also
work on 3.11. Periodic testing should be enough for this.
* Python 3.12 (available as default in Ubuntu 24.04)
This is the upper bound of required testing for 2025.1.
More details on Python requirements can be found in :ref:`pti-python`.
Advance/Unstable Testing
========================
The below list is for the distribution/python advance or unstable versions
to test them in OpenStack CI/CD. These may not be part of integrated testing
and may be tested as non-blockers or periodically only. The main idea is to
test them in advance to be part of integrated testing in future
cycles.
Based on their testing infra setup, instability, or their future
releases, we can modify the list during any phase of the current development
cycle.
* CentOS Stream 9
* Rocky Linux 9