Absent maintainer entries are as well a frequent source of friction, as they are checked
only in selftest, and so aren't revealed until autobuilder runs.
The selftest is retained as it also checks for obsolete entries in maintainers.inc
(not possible to do in insane class).
I've seen many errors triggered by this and was wondering what's going on and it's caused by meta-security layers which provide own conf/distro/include/maintainers.inc:
meta-security $ find . -name maintainers.inc
./meta-tpm/conf/distro/include/maintainers.inc
./conf/distro/include/maintainers.inc
So this doesn't work well with:
meta/conf/distro/defaultsetup.conf:include conf/distro/include/maintainers.inc
as it "replaces" the file instead of adding more RECIPE_MAINTAINERs.
I think this should be fixed somehow before this gets enabled in oe-core.