Hi Enrico, > in the Developers's reference[1] it says, in boldface, that security > updates should be built with "urgency=high".
This is incorrect advice and I have idea where it came from. The urgency is completely irrelevant for any security upload to LTS/oldstable/stable, only for testing-security uploads when these were still a thing (maybe that's how this trickled in). Cheers, Moritz