Description of problem:
For DCN setups in particular, it is not clear how to add a new site into existing deployment. AFAIK that involves creating new leaf in the existing spine-leaf setup, then adding computes there, and finally placing them into a new AZ.

That bug is focused on providing documentation on how to add a new subnet into undercloud.conf and apply that change into existing spine-leaf setup. That can be general networking documentation, not necessarily the DCN-specific one.

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See also: http://post-office.corp.redhat.com/archives/rhos-tech/2020-August/msg00292.html