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> If you mean only 4.1 and 5.0 would be online upgrade targets, I would > suggest we change that to T-3 so you encompass all “currently supported” > releases at the time the new branch is GAed. > > I think that's better actually, yeah. I was originally thinking T-2 from > the "what calendar time frame is reasonable" perspective, but saying "if > you're on a currently supported branch you can upgrade to a release that > comes out" makes clean intuitive sense. That'd mean: > > 6.0: 5.0, 4.1, 4.0 online upgrades supported. Drop support for 4.0. API > compatible guaranteed w/5.0. > 7.0: 6.0, 5.0, 4.1 online upgrades supported. Drop support for 4.1. API > compatible guaranteed w/6.0. > 8.0: 7.0, 6.0, 5.0 online upgrades supported. Drop support for 5.0. API > compatible guaranteed w/7.0. > I like this.