Drupal from 10.6.17 to 11.4.7

web/modules/custom/login_tracker/login_tracker.module

@@ -35,17 +35,17 @@ function login_tracker_user_login($account) {
   \Drupal::moduleHandler()->alter('login_tracker_login_data', $data, $account);
   $data = serialize($data);
 
-  $keys = [
-    'record_id' => NULL,
-  ];
   $fields = [
     'uid'             => $account->id(),
     'login_timestamp' => \Drupal::time()->getRequestTime(),
     'data'            => $data,
   ];
 
-  \Drupal::database()->merge('login_tracker')
-    ->key($keys)
+  // Core 11 narrowed Merge::key() to a string field, so the historical
+  // merge->key(['record_id' => NULL]) trick no longer works. A plain insert
+  // is exactly what it did (the NULL key never matched, forcing an insert
+  // per login).
+  \Drupal::database()->insert('login_tracker')
     ->fields($fields)
     ->execute();
 }

web/modules/custom/materio_flag/materio_flag.install

@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * @file
+ * Install, update and uninstall functions for the materio_flag module.
+ */
+
+/**
+ * Fix flag configs with empty labels.
+ *
+ * Flag lists (flag_lists) can create relflag_* flag configs without a label.
+ * Core 10 silently tolerated NULL labels, but core 11 typed
+ * Html::escape() as string, which makes \Drupal::token()->getInfo() fatal
+ * (the flag tokens build t('@flag flag link', ['@flag' => $flag->label()])).
+ *
+ * Give every flag a string label: the related flagging collection name when
+ * available, the flag ID as a fallback.
+ */
+function materio_flag_update_10200(&$sandbox = NULL) {
+  $flags = \Drupal::service('flag')->getAllFlags();
+  $fixed = 0;
+  foreach ($flags as $id => $flag) {
+    $label = $flag->label();
+    if (is_string($label) && $label !== '') {
+      continue;
+    }
+    $new_label = $id;
+    if (preg_match('/^relflag_(\d+)_/', $id, $matches)) {
+      $collection = \Drupal::entityTypeManager()->getStorage('flagging_collection')->load($matches[1]);
+      if ($collection && is_string($collection->label()) && $collection->label() !== '') {
+        $new_label = $collection->label();
+      }
+    }
+    $flag->set('label', $new_label)->save();
+    $fixed++;
+  }
+  return t('@count flag(s) with an empty label have been fixed.', ['@count' => $fixed]);
+}