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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
I had a bunch of output devices appearing through my monitor via HDMI, and I never use them. I wanted to disable them, so I added support for it by adding a property to the devices. For consistency I also added it to nodes.
I also added an example + description of usage in the configuration which people can easily uncomment to use.