code: private boolean isSeedHeartbeatValid()
    {
      boolean isSeed = false;
      
      for (ServerHeartbeat server : _serverSelf.getCluster().getSeedServers()) {
        if (server.port() > 0) {
          isSeed = true;
          
          if (server.isUp()) {
            return true;
          }
        }
      }
  
      return ! isSeed;
    }
docs: Returns true if one of the cluster seeds is an active server.