code: def get_all_response(self, sort_order=None, sort_target='key',
                           keys_only=False):
          
          range_request = self._build_get_range_request(
              key=b'\0',
              range_end=b'\0',
              sort_order=sort_order,
              sort_target=sort_target,
              keys_only=keys_only,
          )
  
          return self.kvstub.Range(
              range_request,
              self.timeout,
              credentials=self.call_credentials,
              metadata=self.metadata
          )
docs: Get all keys currently stored in etcd.