Merge pull request #4995 from BerriAI/litellm_otel_fwd_traceparent

[Fix-OTEL Proxy] Only forward traceparent to llm api when `litellm.forward_traceparent_to_llm_provider=True`

docs/my-website/docs/proxy/logging.md

@@ -714,6 +714,23 @@ Search for Trace=`80e1afed08e019fc1110464cfa66635c` on your OTEL Collector
 
 <Image img={require('../../img/otel_parent.png')} />
 
+### Forwarding `Traceparent HTTP Header` to LLM APIs
+
+Use this if you want to forward the traceparent headers to your self hosted LLMs like vLLM
+
+Set `forward_traceparent_to_llm_provider: True` in your `config.yaml`. This will forward the `traceparent` header to your LLM API
+
+:::warning
+
+Only use this for self hosted LLMs, this can cause Bedrock, VertexAI calls to fail
+
+:::
+
+```yaml
+litellm_settings:
+  forward_traceparent_to_llm_provider: True
+```
+
 ## Custom Callback Class [Async]
 
 Use this when you want to run custom callbacks in `python`

litellm/__init__.py

@@ -165,6 +165,7 @@ budget_duration: Optional[str] = (
 default_soft_budget: float = (
     50.0  # by default all litellm proxy keys have a soft budget of 50.0
 )
+forward_traceparent_to_llm_provider: bool = False
 _openai_finish_reasons = ["stop", "length", "function_call", "content_filter", "null"]
 _openai_completion_params = [
     "functions",

litellm/proxy/litellm_pre_call_utils.py

@@ -3,6 +3,7 @@ from typing import TYPE_CHECKING, Any, Dict, Optional
 
 from fastapi import Request
 
+import litellm
 from litellm._logging import verbose_logger, verbose_proxy_logger
 from litellm.proxy._types import CommonProxyErrors, TeamCallbackMetadata, UserAPIKeyAuth
 from litellm.types.utils import SupportedCacheControls
@@ -250,6 +251,8 @@ def _add_otel_traceparent_to_data(data: dict, request: Request):
         # if user is not use OTEL don't send extra_headers
         # relevant issue: https://github.com/BerriAI/litellm/issues/4448
         return
+
+    if litellm.forward_traceparent_to_llm_provider is True:
         if request.headers:
             if "traceparent" in request.headers:
                 # we want to forward this to the LLM Provider

litellm/tests/test_proxy_utils.py

@@ -1,9 +1,16 @@
 import asyncio
+import os
+import sys
 from unittest.mock import Mock
 
 import pytest
 from fastapi import Request
 
+import litellm
+
+sys.path.insert(
+    0, os.path.abspath("../..")
+)  # Adds the parent directory to the system path
 from litellm.proxy._types import UserAPIKeyAuth
 from litellm.proxy.litellm_pre_call_utils import add_litellm_data_to_request
 from litellm.types.utils import SupportedCacheControls
@@ -13,7 +20,7 @@ from litellm.types.utils import SupportedCacheControls
 def mock_request(monkeypatch):
     mock_request = Mock(spec=Request)
     mock_request.query_params = {}  # Set mock query_params to an empty dictionary
-    mock_request.headers = {}
+    mock_request.headers = {"traceparent": "test_traceparent"}
     monkeypatch.setattr(
         "litellm.proxy.litellm_pre_call_utils.add_litellm_data_to_request", mock_request
     )
@@ -60,3 +67,38 @@ async def test_add_litellm_data_to_request_non_thread_endpoint(endpoint, mock_re
 
     assert "metadata" in data
     assert "litellm_metadata" not in data
+
+
+# test adding traceparent
+
+
+@pytest.mark.parametrize(
+    "endpoint", ["/chat/completions", "/v1/completions", "/completions"]
+)
+@pytest.mark.asyncio
+async def test_traceparent_not_added_by_default(endpoint, mock_request):
+    """
+    This tests that traceparent is not forwarded in the extra_headers
+
+    We had an incident where bedrock calls were failing because traceparent was forwarded
+    """
+    from litellm.integrations.opentelemetry import OpenTelemetry
+
+    otel_logger = OpenTelemetry()
+    setattr(litellm.proxy.proxy_server, "open_telemetry_logger", otel_logger)
+
+    mock_request.url.path = endpoint
+    user_api_key_dict = UserAPIKeyAuth(
+        api_key="test_api_key", user_id="test_user_id", org_id="test_org_id"
+    )
+    proxy_config = Mock()
+
+    data = {}
+    await add_litellm_data_to_request(
+        data, mock_request, user_api_key_dict, proxy_config
+    )
+
+    print("DATA: ", data)
+
+    _extra_headers = data.get("extra_headers") or {}
+    assert "traceparent" not in _extra_headers