code: def log_failure_event(
      self, kwargs, response_obj, start_time, end_time
  ):
      print(f"On Failure")
  
file_path: litellm/litellm/tests/test_router_policy_violation.py
imports: import sys, os, time
  import traceback, asyncio
  import pytest
  import litellm
  from litellm import Router
  from litellm.integrations.custom_logger import CustomLogger
label_desc: Use image node_id 6 for calling the MyCustomHandler obj's underlying member method code with example usage: obj.log_failure_event(kwargs, response_obj, start_time, end_time) without return types