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Microversions
API v2.1 supports Microversions: small, documented changes to the API. A user can use Microversions to discover the latest API version supported in their cloud. A cloud that is upgraded to support newer versions will still support all older versions to maintain the backward compatibility for those users who depend on older versions. Users can also discover new features easily with Microversions, so that they can benefit from all the advantages and improvements of the current cloud.
There are multiple cases which you can resolve with Microversions:
Legacy v2 API user with new cloud
The minimum version of Microversions is 2.1, which is a version compatible with the legacy v2 API. The legacy v2 API user doesn't need to worry that their older client software will be broken when their cloud is upgraded with new versions. And the cloud operator doesn't need to worry that upgrading their cloud to newer versions will break any user with older clients that don't expect these changes.
TODO: add more use-cases for Microversions