MDL-82297 core: Add notification to warn admins

* In Moodle 5.0 we will remove Chat and Survey module
and we will need to announce it beforehand

admin/renderer.php

@@ -295,6 +295,7 @@ public function admin_notifications_page($maturity, $insecuredataroot, $errorsdi
 
         $output .= $this->header();
         $output .= $this->output->heading(get_string('notifications', 'admin'));
+        $output .= $this->upgrade_news_message();
         $output .= $this->maturity_info($maturity);
         $output .= empty($CFG->disableupdatenotifications) ? $this->available_updates($availableupdates, $availableupdatesfetch) : '';
         $output .= $this->insecure_dataroot_warning($insecuredataroot);
@@ -754,6 +755,21 @@ protected function moodle_copyright() {
         return $this->box($copyrighttext, 'copyright');
     }
 
+    /**
+     * Display a transient notification for important upgrades messages for
+     * specific releases.
+     *
+     * @return string HTML to output.
+     */
+    protected function upgrade_news_message() {
+        return $this->notification(
+            get_string('importantupdates_content', 'admin'),
+            'info',
+            false,
+            get_string('importantupdates_title', 'admin')
+        );
+    }
+
     /**
      * Display a warning about installing development code if necesary.
      * @param int $maturity
@@ -776,6 +792,7 @@ protected function maturity_info($maturity) {
         return $this->warning($warningtext, $level);
     }
 
+
     /**
      * Displays the info about available Moodle core and plugin updates
      *

lang/en/admin.php

@@ -764,6 +764,11 @@
 $string['iconvrequired'] = 'Installing ICONV extension is required.';
 $string['igbinary322buggyversion'] = 'The php-igbinary extension installed on the site can lead to problems when running with PHP 7.2. You are recommended to either upgrade to php-igbinary 3.2.5 or later, or alternatively to upgrade to PHP 7.3 or later.';
 $string['ignore'] = 'Ignore';
+$string['importantupdates_content'] = '<p>In the next Moodle 5.0, planned for release in April 2025, the Chat and Survey activities will
+be removed from core Moodle. They will be available as plugins in the
+<a href="https://moodle.org/plugins/">Moodle plugins directory</a>.</p>
+<p>If you wish to continue using Chat or Survey in your site, you will be able to install them as plugins before upgrading to Moodle 5.0.</p>';
+$string['importantupdates_title'] = 'Important update about Chat and Survey activities';
 $string['includemoduleuserdata'] = 'Include module user data';
 $string['incompatibleblocks'] = 'Incompatible blocks';
 $string['indexdata'] = 'Index data';