code: func (s *State) StateSnapshotMeta() statemgr.SnapshotMeta {
  	return statemgr.SnapshotMeta{
  		Lineage: s.lineage,
  		Serial:  s.serial,
  	}
  }
docs: // StateSnapshotMeta returns the metadata from the most recently persisted
  // or refreshed persistent state snapshot.
  //
  // This is an implementation of statemgr.PersistentMeta.