magento-test/app/code/Magento/MediaContentCms/etc/events.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="cms_page_delete_before">
        <observer name="media_content_cms_page_delete_before" instance="Magento\MediaContentCms\Observer\PageDelete" />
    </event>
    <event name="cms_page_save_after">
        <observer name="media_content_cms_page_save_after" instance="Magento\MediaContentCms\Observer\Page" />
    </event>
     <event name="cms_block_delete_before">
        <observer name="media_content_cms_block_delete_before" instance="Magento\MediaContentCms\Observer\BlockDelete" />
    </event>
    <event name="cms_block_save_after">
        <observer name="media_content_cms_block_save_after" instance="Magento\MediaContentCms\Observer\Block" />
    </event>
</config>