DMAIC - Define, Measure, Analyse, Improve, Control in the DevOps world? Six Sigma's DMAIC (see also Wikipedia) has been there before continuous procedures, so I think more or less these concepts have been nourishing itil, then CI/CD and now DevOps as well.

Still I am not sure whether we have an established data model for example to allow DMAIC across many iterations.

Question: do you know of examples of practices/ aligning DMAIC with DevOps (at the measure side, first of all)? Does it make sense?
Yes, DMAIC makes sense. If processes like CD need to be improved it is important to have a baseline. Therefore the Measure step is useful. The team investigates the status of process X, e.g. CD by documenting the current status.