code: def get_summary(self) -> str:
      return f"Success: {len(self._success_events)}; Failure: {len(self._failure_events)}"
  
file_path: gokart/gokart/slack/event_aggregator.py
imports: import os
  from logging import getLogger
  from typing import List, TypedDict
  import luigi
label_desc: Use image node_id 3 for calling the EventAggregator obj's underlying member method code with example usage: obj.get_summary() and returns: str, len, str, len