code: func (s *Server) setQueryMeta(m *structs.QueryMeta) {
  	if s.IsLeader() {
  		m.LastContact = 0
  		m.KnownLeader = true
  	} else {
  		m.LastContact = time.Since(s.raft.LastContact())
  		m.KnownLeader = (s.raft.Leader() != "")
  	}
  }
docs: // setQueryMeta is used to populate the QueryMeta data for an RPC call