Beginning with Jenkins 2.335 and Jenkins 2.332.1, the Jenkins project is migrating from System V init(8) to systemd(1) in its official Debian, Red Hat, and openSUSE packages.
The official Docker image and Helm chart remain unchanged.
For up-to-date information, refer to the Managing systemd services page in the documentation.
Background
Beginning in 2008, the Jenkins (then Hudson) project has delivered Linux OS installation packages for Debian (and derivatives),...