Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/statistics/statistics.php

@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * @file
+ * Handles counts of node views via AJAX with minimal bootstrap.
+ */
+
+use Drupal\Core\DrupalKernel;
+use Symfony\Component\HttpFoundation\Request;
+
+chdir('../../..');
+
+$autoloader = require_once 'autoload.php';
+
+$kernel = DrupalKernel::createFromRequest(Request::createFromGlobals(), $autoloader, 'prod');
+$kernel->boot();
+
+$views = $kernel->getContainer()
+  ->get('config.factory')
+  ->get('statistics.settings')
+  ->get('count_content_views');
+
+if ($views) {
+  $nid = filter_input(INPUT_POST, 'nid', FILTER_VALIDATE_INT);
+  if ($nid) {
+    \Drupal::database()->merge('node_counter')
+      ->key('nid', $nid)
+      ->fields(array(
+        'daycount' => 1,
+        'totalcount' => 1,
+        'timestamp' => REQUEST_TIME,
+      ))
+      ->expression('daycount', 'daycount + 1')
+      ->expression('totalcount', 'totalcount + 1')
+      ->execute();
+  }
+}
+