metadata: (99) upstream_node: node_1 (1) Pong metadata: (99) upstream_node: node_1 (1) (type: bytes, field: 1, length: 3): “bar” (type: bytes, field: 99, length: N): [(type: bytes, field: 1, length: 6): “node_1”] (type: bytes, field: 1, length: 3): “bar” (type: bytes, field: 99, length: N): [(type: bytes, field: 1, length: 6): “node_1”] protobuf serialization: messages: