Use Drupal::messenger

Follow the patch!

Follow the patch!

What is the difference between addMessage and addStatus? In GA you used addStatus and here addMessage in .install. What is right now for the same code?
The addMessage works as a drupal_set_message, \Drupal::messenger()->addMessage('New message', 'status'); and addStatus is only used to add status type messages.

  /**
   * Adds a new message to the queue.
   *
   * The messages will be displayed in the order they got added later.
   *
   * @param string|\Drupal\Component\Render\MarkupInterface $message
   *   (optional) The translated message to be displayed to the user. For
   *   consistency with other messages, it should begin with a capital letter
   *   and end with a period.
   * @param string $type
   *   (optional) The message's type. Either self::TYPE_STATUS,
   *   self::TYPE_WARNING, or self::TYPE_ERROR.
   * @param bool $repeat
   *   (optional) If this is FALSE and the message is already set, then the
   *   message won't be repeated. Defaults to FALSE.
   *
   * @return $this
   */
  public function addMessage($message, $type = self::TYPE_STATUS, $repeat = FALSE);

I think it would look like this:

dependencies:
  - blazy:blazy (>= 2.x)

But then the installation would have to be done using the composer