Here's a presentation at HEPiX'21 from CERN that's publicly available:
    https://indico.cern.ch/event/995485/contributions/4256466/
My summary was much more succinct than the presentation and is partly my
own interpretation.  The presentation lists a whole bunch of options and
basically says that they're sticking with something related to RHEL,
will decide later which one, and in the meanwhile we can use CentOS 8
until the end of this year or CentOS 8 stream.

Dave

On Fri, Apr 30, 2021 at 05:03:20PM -0500, John R. Dennison wrote:
> On Fri, Apr 30, 2021 at 09:35:02PM +0000, Dave Dykstra wrote:
> > Both Fermilab and CERN have stated that they plan to use CentOS 8 stream
> > for now (or Scientific Linux 7 or CentOS 7) and will evaluate later
> > whether or not to switch to one of the clones.
> 
> Can you please provide a citation for this?  The last I recall hearing
> was what Konstantin referred to - that an official statement from
> CERN would be forthcoming in Q1 of this year but I have yet to see such
> a statement and am wondering if, perhaps, I overlooked it somehow.
> 
> Thank you,
> 
> 
> 
> 
> 							John
> -- 
> "Be polite, be professional, but have a plan to kill everybody you meet."
> 
> -- General James "Mad Dog" Mattis