When doing cluster-wide restore using topology coordinator, the
coordinator will need to serve a bunch of new tablet transition kinds --
the restore one. For that, it will need to receive information about
from where to perform the restore -- the endpoint and bucket pair. This
data can be grabbed from nowhere but the tablet transition itself, so
add the "restore_config" member with this data.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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