Unexpected OpenTelemetry logging from weather-service

[esnible]

The weather service is coded to log its instrumentation startup:

    logger.info("Setting up OpenTelemetry observability")
    logger.info(f"  Service: {service_name}")

However, those logs to not appear in kubectl logs ...

When it receives an A2A query from Kagenti, the weather service logs

DEBUG:opentelemetry.instrumentation.openai.shared:OpenLLMetry failed to trace in _set_response_attributes, error: Traceback (most recent call last):
  File "/app/.venv/lib/python3.12/site-packages/opentelemetry/instrumentation/openai/utils.py", line 147, in sync_wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/app/.venv/lib/python3.12/site-packages/opentelemetry/instrumentation/openai/shared/__init__.py", line 232, in _set_response_attributes
    prompt_tokens_details = dict(usage.get("prompt_tokens_details", {}))
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not iterable

This error is unexpected. It has no stack trace and is thus hard to troubleshoot.

Perhaps related to the above, in Phoenix the root spans show 0 cumulative tokens, but if a root span is expanded its inner ChatOpenAI span shows token usage.

cc @Ladas