Hi @guwirth,
Thank you for your question and for digging into this so deeply!
That’s right, today we will give new rules that only have type+severity defined (standard experience) a quality+severity so they work in MQR mode.
If you are using generic issues defined using an older format, you get Maintainability+Medium. With the newer format you get pretty much what you would expect except Blocker → High and Info → Low as you spotted. We initially mapped Blocker in standard to High and Info → Low in the new severity system because we wanted to avoid a load of rules suddenly appear as Blocker/Info before users used to Low/Medium/High were ready to handle them. This isn’t ideal because you don’t get a rule being treated in the same way in both modes. We are looking to go to the more obvious Blocker/Info (standard) → Blocker/Info (MQR) mapping now that we’ve had the 5 severities in MQR mode for a little bit. I don’t have a date when we expect to do that by just yet. We will also look to update the docs to make it easier for other people to find the answer to the question you raised.
Thank you again for your question because it helps us improve the Sonar experience.
John