code: def close(self):
      with self._condition:
          self._open = False
          self._condition.notify()
  
imports: import collections
  import threading
  from aim.ext.transport.proto import health_pb2
  from aim.ext.transport.proto import health_pb2_grpc
label_desc: Use image node_id 7 for calling the _Watcher obj's underlying member method code with example usage: obj.close() without return types