Matrix configuration with Jenkins pipelines

Question

The Jenkins Pipeline plugin (aka Workflow) can be extended with other Multibranch plugins to build branches and pull requests automatically.

What would

Answer 1

As noted by @StephenKing, Blue Ocean will show parallel branches better than the current stage view. A planned upcoming version of the stage view will be able to show all the branches, though it will not visually indicate any nesting structure (would look the same as if you ran the configurations serially).

In any event, the deeper issue is that you will essentially only get a pass/fail status for the build overall, pending a resolution to JENKINS-27395 and related requests.