On Oct 15, 2015, at 11:23 AM, Ihar Hrachyshka 
<ihrac...@redhat.com<mailto:ihrac...@redhat.com>> wrote:

I also feel that upgrades are in lots of ways not only a technical issue, but a 
cultural one too. You should have reviewers being aware of all the moving 
parts, and how a seemingly innocent change can break the flow. That’s why I 
plan to start on a devref page specifically about upgrades, where we could lay 
ground about which scenarios we should support, and those we should not (f.e. 
we have plenty of compatibility code in agents that to handle old controller 
scenario, which should not be supported); how all pieces interact and behave in 
transition, and what to look for during reviews. Hopefully, once such a page is 
up and read by folks, we will be able to have more meaningful conversation 
about our upgrade strategy.

That is a fantastic idea, and would really help me understand this part of the 
Neutron code as a reviewer.  Thanks!

—N.
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