auto_instrument(): LangChain instrumentor fails with wrapt 2.x ('module' kwarg removed)

[vishal-punjabi]

Summary

When sap_cloud_sdk.core.telemetry.auto_instrument() is called in an environment that has wrapt>=2, the LangChain instrumentor fails to install with:

ERROR:root:Error initializing LangChain instrumentor: wrap_function_wrapper() got an unexpected keyword argument 'module'

Traceloop.init swallows the exception and proceeds, so the rest of the OTel pipeline keeps working (other instrumentors, exporters, baggage processor) — but no LangChain / LangGraph spans are emitted, which silently breaks observability for any agent built on LangChain or LangGraph.

Root cause

• traceloop-sdk (currently ~=0.54.0 in pyproject.toml) pulls opentelemetry-instrumentation-langchain (latest published: 0.60.0).
• opentelemetry-instrumentation-langchain calls:

  wrap_function_wrapper(module="langchain...", name="...", wrapper=...)

• wrapt 2.x changed wrap_function_wrapper to wrap_function_wrapper(target, name, wrapper) — the module keyword no longer exists, so the call raises TypeError.
• There is currently no released opentelemetry-instrumentation-langchain version that fixes this, so simply bumping traceloop-sdk does not resolve it.

Reproduction

requirements.txt:

sap-cloud-sdk==0.13.0   # also reproduces with 0.14.x
langchain>=1.0
langgraph>=1.0

Make sure wrapt 2.x is installed (it is currently the latest, so a fresh install gets it):

pip install -r requirements.txt
pip show wrapt        # Version: 2.x

Minimal app:

from sap_cloud_sdk.core.telemetry import auto_instrument
auto_instrument()  # OTEL_EXPORTER_OTLP_ENDPOINT or OTEL_TRACES_EXPORTER=console must be set

Console output includes:

ERROR:root:Error initializing LangChain instrumentor: wrap_function_wrapper() got an unexpected keyword argument 'module'

Confirmed in:

• wrapt==2.1.2
• opentelemetry-instrumentation-langchain==0.60.0
• traceloop-sdk from sap-cloud-sdk==0.13.0 and observed against 0.14.1 (traceloop-sdk~=0.54.0)

Impact

• Any consumer running LangChain / LangGraph agents loses LangChain/LangGraph spans (no chain, node, or graph spans visible in the configured trace backend such as MLflow / OTLP collector / Jaeger).
• Only the silent log line above tells the user; nothing fails loudly.

Proposed fix

Two complementary actions:

1. Interim: add wrapt<2 to pyproject.toml [project] dependencies so the SDK pulls a wrapt 1.x (e.g. 1.17.2) where wrap_function_wrapper(module=...) is still accepted. PR to follow.
2. Long term: track the upstream fix in traceloop/openllmetry → opentelemetry-instrumentation-langchain → switch to positional args (wrap_function_wrapper(target, name, wrapper)); remove the wrapt<2 constraint once a fixed instrumentor release is published and traceloop-sdk pins it.

Happy to update the PR if a different shape is preferred (e.g. a constraint inside the optional starlette/AI extra rather than the core dependency list).