code: def emit(self, metric_data: MetricData):
      pass
  
imports: import abc
  import time
  import warnings
  from collections import namedtuple
  from functools import wraps
  from typing import Dict, Optional
label_desc: Use image node_id 1 for calling the NullMetricHandler obj's underlying member method code with example usage: obj.emit(metric_data) without return types