Documented FAILED_PRECONDITION as a possible error for GetMetadataDelta #591
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If changed block tracking has not been enabled in the underlying storage subsystem then GetMetadataDelta will fail.
This PR documents the gRPC error code that should be returned when this happens.
What type of PR is this?
This is a documentation change only.
What this PR does / why we need it:
This provides information to CSI driver developers on the precise error code to return for this error, and
guidance to the backup application developer on how to respond.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
This change was discussed in the Data Protection Working Group meeting.
Does this PR introduce an API-breaking change?: