Production Outage: How Jenkins 2.440 and Docker 27 Plugin Failures Caused a 2-Hour Build Outage Executive Summary On October 12, 2024, our CI/CD pipeline experienced a total build outage lasting 2 hours and 14 minutes, caused by incompatible updates between Jenkins 2.440 and the Docker plugin version 27. The outage impacted 142 active build jobs, delayed 3 production releases, and affected 47 engineering team members. Incident Timeline (UTC) 14:02 – Jenkins instance automatically updates to version 2.440 per scheduled maintenance window. 14:07 – First build failure reported: Docker plugin 27 throws NullPointerException during container launch. 14:12 – 89% of all build jobs fail; on-call engineering team paged. 14:25 – Root cause identified: Jenkins 2.440 deprecated the ContainerExecProc API used by Docker plugin 27. 14:40 – Rollback of Jenkins to 2.439 attempted, but Docker plugin 27 persists incompatible state. 15:15 – Docker plugin downgraded to version 26.3, compatible with Jenkins 2.439.…