v0 add event handlers for logging fallback events

litellm/router_utils/fallback_event_handlers.py

@@ -0,0 +1,29 @@
+from typing import TYPE_CHECKING, Any
+
+import litellm
+from litellm._logging import verbose_router_logger
+from litellm.integrations.custom_logger import CustomLogger
+
+
+async def log_success_fallback_event(original_model_group: str, kwargs: dict):
+    for _callback in litellm.callbacks:
+        if isinstance(_callback, CustomLogger):
+            try:
+                await _callback.log_success_fallback_event()
+            except Exception as e:
+                verbose_router_logger.error(
+                    f"Error in log_success_fallback_event: {(str(e))}"
+                )
+                pass
+
+
+async def log_failure_fallback_event(original_model_group: str, kwargs: dict):
+    for _callback in litellm.callbacks:
+        if isinstance(_callback, CustomLogger):
+            try:
+                await _callback.log_failure_fallback_event()
+            except Exception as e:
+                verbose_router_logger.error(
+                    f"Error in log_failure_fallback_event: {(str(e))}"
+                )
+                pass