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b71a563030
This adds a new tablet migration kind: repair. It allows tablet repair scheduler to use this migration kind to schedule repair jobs. The current repair scheduler implementation does the following: - A tablet is picked to be repaired when the time since last repair is bigger than a threshold (auto repair mode) or it is requested by user (manual repair mode) - The tablet repair can be scheduled along with tablet migration and rebuild. It runs in the tablet_migration track. - Repair jobs are scheduled in a smart way so that at any point in time, there are no more than configured jobs per shard, which is similar to scylla manager's control. In this patch, both the manual repair and the auto repair are not enabled yet.