Hi Evelyn,
We discussed exactly this a couple of weeks ago with the CNCF, and we're generally very interested in it. The Prometheus OSS project would have to define standard certification criteria, and then companies (like PromLabs, Robust Perception, or others) could offer training material and administer the certification tests. We just haven't gotten around to it yet, as there is always a lot to do. But I'll check in again with people about it, and hopefully at some point we will manage to build such a certification.
Regards,
Julius