A sliding window keeps a bounded set of active API versions, advancing newer versions as older ones move toward removal. It reduces maintenance while delivering frequent functionality, but requires users to accept regular deprecations. section 24.3.2
Rolling version timeline
Version 1 begins as Preview, becomes Current in February, and is Deprecated in March. Meanwhile, Versions 2 and 3 advance behind it; by May, Version 1 is Deleted while Version 5 is Preview.




