fix(logging): keep raw_request when a request has no metadata

pre_call wrote raw_request into a new dict whenever litellm_params had no
metadata or an empty one, so callbacks never saw it. SDK calls usually pass
no metadata, which made log_raw_request_response do nothing for them

Create the metadata dict on litellm_params when it is missing so the raw
request reaches the callbacks

litellm/litellm_core_utils/litellm_logging.py

@@ -1677,7 +1677,9 @@ class Logging(LiteLLMLoggingBaseClass):
             # log raw request to provider (like LangFuse) -- if opted in.
             if self.log_raw_request_response is True or litellm.log_raw_request_response is True:
                 _litellm_params: Final = self.model_call_details.get("litellm_params", {})
-                _metadata: Final = _litellm_params.get("metadata", {}) or {}
+                if _litellm_params.get("metadata") is None:
+                    _litellm_params["metadata"] = {}
+                _metadata: Final = _litellm_params["metadata"]
                 try:
                     self.model_call_details["raw_request_typed_dict"] = RawRequestTypedDict(
                         raw_request_api_base=self._get_masked_api_base(str(additional_args.get("api_base") or "")),

tests/unit/litellm_core_utils/test_litellm_logging.py

@@ -8662,6 +8662,26 @@ def test_pre_call_redacts_and_masks_raw_request(logging_obj):
     assert "key=*****" in raw_api_base
 
 
+@pytest.mark.parametrize("litellm_params", [{}, {"metadata": None}, {"metadata": {}}])
+def test_pre_call_keeps_raw_request_when_request_has_no_metadata(logging_obj, litellm_params):
+    """Callbacks read raw_request from litellm_params metadata, which SDK calls often leave unset."""
+    logging_obj.model_call_details["litellm_params"] = litellm_params
+    logging_obj.log_raw_request_response = True
+
+    logging_obj.pre_call(
+        input="hi",
+        api_key="",
+        additional_args={
+            "api_base": "https://api.openai.com/v1/chat/completions",
+            "headers": {},
+            "complete_input_dict": {"model": "gpt-4o-mini"},
+        },
+    )
+
+    raw_request = logging_obj.model_call_details["litellm_params"]["metadata"]["raw_request"]
+    assert "https://api.openai.com/v1/chat/completions" in raw_request
+
+
 _PRIVATE_RAW_REQUEST_ARGS: Final = {
     "api_base": "https://api.openai.com/v1/chat/completions",
     "headers": {},