apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/config/BizConfig.java/BizConfig/releaseMessageNotificationBatch
class BizConfig:  public int releaseMessageNotificationBatch() {
    int batch = getIntProperty("apollo.release-message.notification.batch", DEFAULT_RELEASE_MESSAGE_NOTIFICATION_BATCH);
    return checkInt(batch, 1, Integer.MAX_VALUE, DEFAULT_RELEASE_MESSAGE_NOTIFICATION_BATCH);
  }