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And the Jenkinsfile documentation is relatively bare and reliant on examples.

Exactly our thought! The whole Jenkins Pipeline is around the notion that your job definition should be version controlled (and you don't necessarily have to lose GUI, see our "blue ocean pipeline editor" that now comes out of the box.

Then the newest kid on the block is https://github.com/jenkinsci/configuration-as-code-plugin, which I referred to in my doc.

jenkins-dsl does wonders in this department. When infrastructure-as-code plugin gets stable we'll have a fully immutable Jenkins setup.

one solution to the problem, if you are building apps for kubernetes is to use Jenkins X which automates all your CI/CD pipelines: https://jenkins-x.io/