Due to a number of known security issues, the jenkins core+plugins needs to be updated. As this would inherently be a downtime event, this will be combined with an “across the board” update including bumping blueocean +2 minor releases (no obvious UI changes), updating docker, system kernel, etc.
The downtime for the jenkins master is expected to be fairly brief and the agent nodes will be updated afterwards in a rolling fashion. The beginning/end of the maintenance period will be announced on #dm-jenkins.
(updated subject to remove the requirement for time travel)