RFD 532:
when there’s no way to ensure that the server side will always be updated first, then servers still need to support the previous release (as in server-side-only versioned), and clients also need to support the API version from the previous release.
When client-side-versioning is necessary, Reconfigurator will provide a reliable way for clients to know which API version they should use. This property will change dynamically at runtime.
This issue is to track implementing the latter part: the reliable way for clients to know which API version they should use.