code: def ReadClientStartupInfo(self, client_id):
      
      history = self.startup_history.get(client_id, None)
      if not history:
        return None
  
      ts = max(history)
      res = rdf_client.StartupInfo.FromSerializedString(history[ts])
      res.timestamp = ts
      return res
docs: Reads the latest client startup record for a single client.