Rolling deploys usually use different cookies, don’t they? But yes, thanks, I’ll mention it.
Actually, this particular issue was the culprit guilty in that OTP was not typed back in 80s, according to Joe and Robert. But nowadays I next to never saw anyone using hot-upgrade feature and if your genservers do not implement GenServer.code_change/3 callback, they are still very prone to issues running different versions on the connected nodes.
