Troubleshooting Langchain Instrumentation Issues in Phoenix

with tracer.start_as_current_span("hybrid retriever") as span:
    span.set_attribute(SpanAttributes.OPENINFERENCE_SPAN_KIND, "RETRIEVER")
    span.set_attribute(SpanAttributes.INPUT_VALUE, question)

    context = await self.retriever_chain.ainvoke({"user_input": question})

    val = json.dumps([_as_document(document) for document in context])
    span.set_attribute(SpanAttributes.RETRIEVAL_DOCUMENTS, val)

def _as_document(document: Any) -> dict:
    document_dict = {}
    if page_content := getattr(document, "page_content", None):
        assert isinstance(page_content, str), f"expected str, found {type(page_content)}"
        document_dict[DocumentAttributes.DOCUMENT_CONTENT] = page_content
    if metadata := getattr(document, "metadata", None):
        assert isinstance(metadata, Mapping), f"expected Mapping, found {type(metadata)}"
        document_dict[DocumentAttributes.DOCUMENT_METADATA] = json.dumps(metadata)
    return document_dict