feat: add show_failed parameter to litellm_history (default true)

When show_failed=False, filters out requests with metadata.exception
or metadata.status='failure' before applying the limit. Useful for
hiding auth probe noise and routing failures. Header shows
'(failed requests hidden)' when active.

litellm_dashboard.py

@@ -247,11 +247,13 @@ class Tools:
         self,
         limit: int = 20,
         show_cost: bool = True,
+        show_failed: bool = True,
     ) -> str:
         """
         Get recent LiteLLM proxy request history.
         :param limit: Number of recent requests to show (1-50, default 20)
         :param show_cost: Include per-request cost (default True)
+        :param show_failed: Include failed requests in output (default True). Set False to hide auth failures, routing errors, etc.
         Returns a formatted table of recent LLM requests with model, status, tokens, duration, and optional cost.
         """
         if not self.valves.litellm_master_key:
@@ -282,12 +284,24 @@ class Tools:
 
         # Sort by startTime descending and take the most recent `limit` entries
         sorted_logs = sorted(data, key=lambda e: e.get("startTime", ""), reverse=True)
+        
+        # Filter out failed requests if show_failed is False
+        if not show_failed:
+            sorted_logs = [
+                e for e in sorted_logs
+                if not (
+                    (e.get("metadata", {}) or {}).get("exception", "")
+                    or (e.get("metadata", {}) or {}).get("status", "") == "failure"
+                )
+            ]
+        
         recent = sorted_logs[:limit]
         total_count = len(data)
+        filtered_note = " (failed requests hidden)" if not show_failed else ""
 
         lines = []
         lines.append(f"LiteLLM Request History — {self._base_url()}")
-        lines.append(f"Showing {len(recent)} of {total_count} total requests (most recent first)")
+        lines.append(f"Showing {len(recent)} of {total_count} total requests{filtered_note} (most recent first)")
         lines.append("=" * 90)
 
         for i, entry in enumerate(recent, 1):