CheckUser CI currently fails on the master branch due to the merging of https://gerrit.wikimedia.org/r/c/mediawiki/core/+/914744.
The fix is to make AbstractCheckUserPager::getIpConds take a IReadableDatabase. Work to make the method instead take a DBQuoter is being done in https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/954051 but that isn't merged yet and is a big change to review just for this build failure.
Doesn't seem to be directly blocking the train except for changes for the CheckUser extension. It also doesn't seem to break the API. Therefore, marking as High priority.
Change 956958 had a related patch set uploaded (by Dreamy Jazz; author: Dreamy Jazz):
[mediawiki/extensions/CheckUser@master] Change AbstractCheckUserPager::getIpConds to use IReadableDatabase
Change 956958 merged by jenkins-bot:
[mediawiki/extensions/CheckUser@master] Change AbstractCheckUserPager::getIpConds to use IReadableDatabase
This shouldn't need QA as this just resolved CI issues, so I'm going to move this to Done and resolve it. Plus, resolving this now means that the it doesn't remain open in the ci-test-error (WMF-deployed Build Failure) column.