When doing T257972, some server reported a disk space issue. The reason is that we have not purged old MediaWiki versions for a while.

Our doc ( https://wikitech.wikimedia.org/wiki/Heterogeneous_deployment/Train_deploys#Tuesday:_New_branch_creation_and_deploy ) states that on Tuesday we have to find them:

find . -mindepth 2 -maxdepth 2 -type f -path './php-*/README' -ctime +7 -exec dirname {} \;

Then scap clean --delete each of them. That clearly has not been done for a while since we have versions up from php-1.35.0-wmf.40.

The root cause is https://gerrit.wikimedia.org/r/c/mediawiki/core/+/607294 which renamed README to README.md thus causing our find command above to fail.