Erik will be the release readiness review ranger this week. S says that some of the tests have been fataling for a while -- he has a writeup of Jenkins tips that the team says would be helpful.
Before fixing the lock-unlock test, I'd like to have some idea of whether Locking a topic should require a reason: https://phabricator.wikimedia.org/T86579. I'm content to let those tests fail until we know.