A version string for this interface. If specified, must have the form
major-version.minor-version, as in
1.10. If the minor version is
omitted, it defaults to zero. If the entire version field is empty, the
major version is derived from the package name, as outlined below. If the
field is not empty, the version in the package name will be verified to be
consistent with what is provided here.
The versioning schema uses semantic versioning where the major version number indicates a breaking change and the minor version an additive, non-breaking change. Both version numbers are signals to users what to expect from different versions, and should be carefully chosen based on the product plan.
The major version is also reflected in the package name of the
interface, which must end in
v<major-version>, as in
google.feature.v1. For major versions 0 and 1, the suffix can
be omitted. Zero major versions must only be used for
experimental, non-GA interfaces.