class_docstr: Interface for working with time and timers.
docstr: Returns the current event-time watermark.
code: def current_watermark(self):
      """
      Returns the current event-time watermark.
      """
      pass
  
file_path: flink/flink-python/pyflink/datastream/timerservice.py
imports: from abc import ABC, abstractmethod
label_desc: Use image node_id 2 for calling the TimerService obj's underlying member method code with example usage: obj.current_watermark() without return types