code: def start(self):
          
          if hasattr(self, 'watch_thread'):
              raise ValueError('Thread watching for resources is already running')
  
          self._list_and_update()
          self.watch_thread = threading.Thread(target=self._watch_and_update)
          # If the watch_thread is only thread left alive, exit app
          self.watch_thread.daemon = True
          self.watch_thread.start()
docs: Start the reflection process!
  
          We'll do a blocking read of all resources first, so that we don't
          race with any operations that are checking the state of the pod
          store - such as polls. This should be called only once at the
          start of program initialization (when the singleton is being created),
          and not afterwards!