class_docstr: A Trigger that fires once the watermark passes the end of the window to which a pane
  belongs.
code: def on_event_time(self, time: int, window: W) -> bool:
      return time == window.max_timestamp()
  
imports: from abc import abstractmethod, ABC
  from typing import Generic
  from pyflink.common.typeinfo import Types
  from pyflink.datastream.state import ValueStateDescriptor
  from pyflink.datastream.window import TimeWindow, CountWindow
  from pyflink.fn_execution.table.window_context import TriggerContext, W
label_desc: Use image node_id 5 for calling the EventTimeTrigger obj's underlying member method code with example usage: obj.on_event_time(time, window) and returns: unknown