Upgrade design doc

I mentioned in the meeting today that work will commence shortly on upgrade function, which is a major area for operator for 1.4. Let me know if you’re interested in authoring this doc, otherwise I’ll create a working doc sometime this week as a starting point.

Hey Martin, I am interested in authoring the design of upgrade function in Istio Operator.

Great, let’s sync up sometime this week. The first step is to get a draft working doc that covers that problems we need to solve.