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[Bug]: DataDogLLMObs: Error sending batch #9494

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@ryuichi1208

Description

@ryuichi1208

What happened?

I am using Proxy mode and when I send image files to LiteLLM when integrated with DataDogLLMObs, I get the following error and no telemetry data is sent. Is this the intended behavior?

Relevant log output

litellm-1      | 03:40:41 - LiteLLM:ERROR: datadog_llm_obs.py:120 - DataDogLLMObs: Error sending batch - Client error '400 Bad Request' for url 'https://api.datadoghq.com/api/intake/llm-obs/v1/trace/spans'
litellm-1      | For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400
litellm-1      | Traceback (most recent call last):
litellm-1      |   File "/usr/lib/python3.13/site-packages/litellm/integrations/datadog/datadog_llm_obs.py", line 100, in async_send_batch
litellm-1      |     response = await self.async_client.post(
litellm-1      |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
litellm-1      |     ...<6 lines>...
litellm-1      |     )
litellm-1      |     ^
litellm-1      |   File "/usr/lib/python3.13/site-packages/litellm/litellm_core_utils/logging_utils.py", line 135, in async_wrapper
litellm-1      |     result = await func(*args, **kwargs)
litellm-1      |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
litellm-1      |   File "/usr/lib/python3.13/site-packages/litellm/llms/custom_httpx/http_handler.py", line 257, in post
litellm-1      |     raise e
litellm-1      |   File "/usr/lib/python3.13/site-packages/litellm/llms/custom_httpx/http_handler.py", line 213, in post
litellm-1      |     response.raise_for_status()
litellm-1      |     ~~~~~~~~~~~~~~~~~~~~~~~~~^^
litellm-1      |   File "/usr/lib/python3.13/site-packages/httpx/_models.py", line 761, in raise_for_status
litellm-1      |     raise HTTPStatusError(message, request=request, response=self)
litellm-1      | httpx.HTTPStatusError: Client error '400 Bad Request' for url 'https://api.datadoghq.com/api/intake/llm-obs/v1/trace/spans'
litellm-1      | For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400

Are you a ML Ops Team?

No

What LiteLLM version are you on ?

v1.65.0

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