snapshots: send highest manifest slot #5932
Open
+759
−222
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Repair can start before the snapshot is fully loaded if the snapshot tiles send the highest manifest slot seen so far. The highest manifest slot is typically the incremental snapshot slot, but can be the full snapshot slot if incremental snapshots are disabled. The highest manifest slot is guaranteed to be monotonically increasing. It is sent by the snaprd tile when a snapshot peer is selected.
Makes use of #5777 to resolve snapshots for each peer.