code: def _redis_notifier(state):
      
      tstamp = time.time()
      state._tstamp = tstamp
      conf = state.app.config
  
      # Notify timestamp
      r = redis.client.StrictRedis()
      r.publish(conf.get('WAFFLE_REDIS_CHANNEL', 'waffleconf'), tstamp)
docs: Notify of configuration update through redis.
  
      Arguments:
          state (_WaffleState): Object that contains reference to app and its
              configstore.