Maintenance scripts launched with mwscript-k8s will soon migrate to PHP 8.3

Hello all,

If you use the mwscript-k8s tool to launch MediaWiki maintenance scripts on
Kubernetes at WMF [0], this message is relevant to you.


*What is changing?*

On Monday, 3rd of November, the mwscript-k8s tool will default to launching
scripts on PHP 8.3 instead of 8.1.

This is part of the ongoing migration of production MediaWiki workloads at
WMF to PHP 8.3 [1] and follows the earlier introduction of 8.3 on an opt-in
basis [2].


*If I encounter issues, is it possible to temporarily use PHP 8.1?*

Yes, if you encounter compatibility issues on 8.3, you can provide the
--php_version=8.1
flag to the mwscript-k8s tool to select 8.1 instead.

Since this fallback will be removed at a later date, please open a sub-task
of [3] to report the issue, so that it can be fixed.


*What about periodic maintenance jobs?*

Production periodic maintenance jobs [4] will migrate later on, trailing
the mwscript-k8s migration by at least 1 week.


Feel free to reach out if you have any questions or concerns, either to me
directly, on this thread, or via a task on Phabricator.

Many thanks,
Scott French
Service Ops SRE


[0] https://wikitech.wikimedia.org/wiki/Maintenance_scripts
[1] https://phabricator.wikimedia.org/T360995
[2]
https://lists.wikimedia.org/hyperkitty/list/[email protected]/thread/WQNSJTTVWXCSVITUR3TWH4DWM6WUHKOS/
[3] https://phabricator.wikimedia.org/T401855
[4] https://wikitech.wikimedia.org/wiki/Mw-cron_jobs

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