Update to Drupal 8.0.5. For more information, see https://www.drupal.org/node/2679347

core/modules/tracker/src/Tests/TrackerTest.php

@@ -432,12 +432,12 @@ class TrackerTest extends WebTestBase {
    * indicators, as well as the "x new" replies link to the tracker.
    * We do this in JavaScript to prevent breaking the render cache.
    *
-   * @param $node_id
+   * @param int $node_id
    *   A node ID, that must exist as a data-history-node-id attribute
-   * @param $node_timestamp
+   * @param int $node_timestamp
    *   A node timestamp, that must exist as a data-history-node-timestamp
    *   attribute.
-   * @param $node_last_comment_timestamp
+   * @param int $node_last_comment_timestamp
    *   A node's last comment timestamp, that must exist as a
    *   data-history-node-last-comment-timestamp attribute.
    * @param bool $library_is_present

core/modules/tracker/tracker.module

@@ -232,11 +232,11 @@ function tracker_comment_delete(CommentInterface $comment) {
 /**
  * Updates indexing tables when a node is added, updated, or commented on.
  *
- * @param $nid
+ * @param int $nid
  *   A node ID.
- * @param $uid
+ * @param int $uid
  *   The node or comment author.
- * @param $changed
+ * @param int $changed
  *   The node updated timestamp or comment timestamp.
  */
 function _tracker_add($nid, $uid, $changed) {
@@ -303,11 +303,11 @@ function _tracker_calculate_changed($node) {
 /**
  * Cleans up indexed data when nodes or comments are removed.
  *
- * @param $nid
+ * @param int $nid
  *  The node ID.
- * @param $uid
+ * @param int $uid
  *   The author of the node or comment.
- * @param $changed
+ * @param int $changed
  *   The last changed timestamp of the node.
  */
 function _tracker_remove($nid, $uid = NULL, $changed = NULL) {