Initial Drupal 11 with DDEV setup

web/core/modules/system/system.theme.inc

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * @file
+ */
+
+use Drupal\Core\Url;
+
+/**
+ * Prepares variables for security advisories fetch error message templates.
+ *
+ * Default template: system-security-advisories-fetch-error-message.html.twig.
+ *
+ * @param array $variables
+ *   An associative array of template variables.
+ */
+function template_preprocess_system_security_advisories_fetch_error_message(array &$variables): void {
+  $variables['error_message'] = [
+    'message' => [
+      '#markup' => t('Failed to fetch security advisory data:'),
+    ],
+    'items' => [
+      '#theme' => 'item_list',
+      '#items' => [
+        'documentation_link' => t('See <a href=":url">Troubleshooting the advisory feed</a> for possible causes and resolutions.', [':url' => 'https://www.drupal.org/docs/updating-drupal/responding-to-critical-security-update-advisories#s-troubleshooting-the-advisory-feed']),
+      ],
+    ],
+  ];
+  if (\Drupal::moduleHandler()->moduleExists('dblog') && \Drupal::currentUser()->hasPermission('access site reports')) {
+    $options = ['query' => ['type' => ['system']]];
+    $dblog_url = Url::fromRoute('dblog.overview', [], $options);
+    $variables['error_message']['items']['#items']['dblog'] = t('Check <a href=":url">your local system logs</a> for additional error messages.', [':url' => $dblog_url->toString()]);
+  }
+  else {
+    $variables['error_message']['items']['#items']['logs'] = t('Check your local system logs for additional error messages.');
+  }
+}