The French Wikipedia wants to update its logo for the passage of two million items, and keep it for a month.
The change will be made using a Mediawiki:Common.css hack so that it is effective as soon as possible, as said in the doc.
Nevertheless, several elements such as T98640 indicate that this modification is clearly not optimal for the cache, and that large wikis like frwiki should rather go through configuration modification via the logo file present in operations/mediawiki-config.
So, is the edit of the repo needed in our case?