If anyone is reading this: I have no idea how to retroactively apply the "review required" label here. Is there anything left I can or am supposed to do here?

I've gone and applied the labels (you need to have the reviewer privilege to apply labels).

I'm afraid it might take a while for us to review this because we have a huge backlog.

I've also started a CI run. Note that due the ramp-up to the 4.0 release next month, we have made a lot of incompatible changes lately, so you may run into unrelated failures. If so, rebasing on top of development will help. But there's no urgency in rebasing since it will take a while before we can review.

Thanks. Unless someone else tried doing exactly the same thing, I doubt that this addition causes any conflicts but I will have a look at what changes in the development branch from time to time.