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web/core/modules/tracker/tracker.pages.inc

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+<?php
+
+/**
+ * @file
+ * User page callbacks for tracker.module.
+ */
+
+use Drupal\tracker\Controller\TrackerController;
+
+/**
+ * Page callback: Generates a page of tracked nodes for the site.
+ *
+ * Queries the database for info, adds RDFa info if applicable, and generates
+ * the render array that will be used to render the page.
+ *
+ * @param \Drupal\user\UserInterface $account
+ *   (optional) The user account to track.
+ *
+ * @return array
+ *   A renderable array.
+ *
+ * @deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use
+ *   \Drupal\tracker\Controller\TrackerController::buildContent() instead.
+ *
+ * @see https://www.drupal.org/node/3030645
+ */
+function tracker_page($account = NULL) {
+  @trigger_error(__FUNCTION__ . ' is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use \Drupal\tracker\Controller\TrackerController::buildContent() instead. See https://www.drupal.org/node/3030645', E_USER_DEPRECATED);
+  return \Drupal::classResolver(TrackerController::class)->buildContent($account);
+}