code: func ackPublishHealthMetricHandler(timer *time.Timer) func(*ecstcs.AckPublishHealth) {
  	return func(*ecstcs.AckPublishHealth) {
  		seelog.Debug("Received ACKPublishHealth from tcs")
  		timer.Reset(retry.AddJitter(defaultHeartbeatTimeout, defaultHeartbeatJitter))
  	}
  }
docs: // ackPublishHealthMetricHandler consumes the ack message from backend. The backend sends
  // the ack each time it processes a health message