diff --git a/litellm/integrations/langsmith.py b/litellm/integrations/langsmith.py
index 12ed1ac708..97242a2616 100644
--- a/litellm/integrations/langsmith.py
+++ b/litellm/integrations/langsmith.py
@@ -66,9 +66,28 @@ class LangsmithLogger(CustomLogger):
 
     def _prepare_log_data(self, kwargs, response_obj, start_time, end_time):
         import datetime
+        from datetime import datetime as dt
         from datetime import timezone
 
         metadata = kwargs.get("litellm_params", {}).get("metadata", {}) or {}
+        new_metadata = {}
+        for key, value in metadata.items():
+            if (
+                isinstance(value, list)
+                or isinstance(value, str)
+                or isinstance(value, int)
+                or isinstance(value, float)
+            ):
+                new_metadata[key] = value
+            elif isinstance(value, BaseModel):
+                new_metadata[key] = value.model_dump_json()
+            elif isinstance(value, dict):
+                for k, v in value.items():
+                    if isinstance(v, dt):
+                        value[k] = v.isoformat()
+                new_metadata[key] = value
+
+        metadata = new_metadata
 
         kwargs["user_api_key"] = metadata.get("user_api_key", None)
         kwargs["user_api_key_user_id"] = metadata.get("user_api_key_user_id", None)
@@ -124,6 +143,7 @@ class LangsmithLogger(CustomLogger):
             "start_time": start_time,
             "end_time": end_time,
             "tags": tags,
+            "extra": metadata,
         }
 
         if run_id:
diff --git a/litellm/proxy/_new_secret_config.yaml b/litellm/proxy/_new_secret_config.yaml
index 1c789d3913..87a561e318 100644
--- a/litellm/proxy/_new_secret_config.yaml
+++ b/litellm/proxy/_new_secret_config.yaml
@@ -3,5 +3,5 @@ model_list:
     litellm_params:
       model: "*"
 
-general_settings:
-  disable_spend_logs: true
\ No newline at end of file
+litellm_settings:
+  success_callback: ["langsmith"]
\ No newline at end of file