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Have you run openstack? There are million dollar companies out there that just support maintaining any updating openstack for a reason...

Their list of pieces and parts gives a good insight to how complicated the beast is: https://www.openstack.org/software/project-navigator#tiles

I worked in/on Openstack for 3.5 years. It's next to impossible to run it without patches, so it's questionable if they can do auto-updates on releases of the LTS channel. Someone needs to sit down and migrate patches and remove any breakages.

auto-updating openstack on production systems people don't know how to run themselves sounds pretty much like the most dangerous thing you could possibly come up with.

why not just hand your systems over to a smart 15 year old kid to run, and go take a nice beachside vacation in the meantime? probably would work out better.