code: def test_grpc_census(inputs):
      assert int(os.environ.get("JINA_GRPC_SEND_BYTES", 0)) == 0
      assert int(os.environ.get("JINA_GRPC_RECV_BYTES", 0)) == 0
      with Flow().add().add() as f:
          f.post(
              on="/",
              inputs=inputs,
          )
      assert int(os.environ["JINA_GRPC_SEND_BYTES"]) > 0
      assert int(os.environ["JINA_GRPC_RECV_BYTES"]) > 0
      # add some route info, so size must be larger
      assert int(os.environ["JINA_GRPC_SEND_BYTES"]) < int(
          os.environ["JINA_GRPC_RECV_BYTES"]
      )
      del os.environ["JINA_GRPC_SEND_BYTES"]
      del os.environ["JINA_GRPC_RECV_BYTES"]
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_grpc_census(inputs) without return types