As a server admin I should be able to control whether my clients get upgrade notices, esp. for breaking changes where both client and server need to be upgraded together. At my company dozens of people have asked why they even get prompted for the 3.x version when the server is still on 2.x. Many companies have change control policies or software packaging regimes which prevent quick software upgrades. The ability to specify at the server that you want to suppress upgrade notices would make the job of administrator easier.