Ticket #25991: 25991.3.diff

src/wp-admin/update-core.php

@@ -521 +521 @@
         if ( $core || $plugins || $themes )
                 list_translation_updates();
         unset( $core, $plugins, $themes );
-        do_action('core_upgrade_preamble');
+        /**
+         * Fires after the core, plugin, and theme update forms.
+         *
+         * @since 2.9.0
+         */
+        do_action( 'core_upgrade_preamble' );
         echo '</div>';
         include(ABSPATH . 'wp-admin/admin-footer.php');
 
@@ -627 +632 @@
         require_once( ABSPATH . 'wp-admin/admin-footer.php' );
 
 } else {
-        do_action('update-core-custom_' . $action);
+        /**
+         * Fires when no default conditions match the action parameter in the URL.
+         *
+         * The dynamic portion of the hook name, $action, refers to the action
+         * parameter in the URL.
+         *
+         * @since 3.2.0
+         */
+        do_action( "update-core-custom_{$action}" );
 }