The master paladin is failing with:

content: {"error": {"message": "User user:446450136466-mko2u1g65l7iqsos5c09tni364ejqg75@developer.gserviceaccount.com cannot search builds in bucket master.chromiumos"}}

It is also failing to schedule slave builds, resulting in all builders (apart from master) showing "skipped" in Legoland.

This is bringing down all of CQ. A hopeful fix is pending.