Thanks Tony and Thomas.
https://www.ovirt.org/documentation/ contains docs for using
oVirt, but not docs for developing oVirt.
Somewhat I agree on "I also have not encountered any useful oVirt/RHV architecture
books. The
ones I found were very much "do this, do that" and didn't help me as a
technical architect.". oVirt is open sourced under Apache License, but seems like
currently it's not open to contributors or 3rd party developers who want to modify and
rebuild from the source code?