diff --git a/core/modules/auto_updates/auto_updates.install b/core/modules/auto_updates/auto_updates.install
index 424c4e8e7b..81c78c35b0 100644
--- a/core/modules/auto_updates/auto_updates.install
+++ b/core/modules/auto_updates/auto_updates.install
@@ -18,20 +18,20 @@ function auto_updates_requirements($phase) {
   }
 
   $requirements = [];
-  /** @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker */
-  $checker = \Drupal::service('auto_updates.readiness_checker');
-  if (!$checker->isEnabled()) {
+  /** @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker_manager */
+  $checker_manager = \Drupal::service('auto_updates.readiness_checker');
+  if (!$checker_manager->isEnabled()) {
     return [];
   }
 
-  $last_check_timestamp = $checker->timestamp();
+  $last_check_timestamp = $checker_manager->timestamp();
   $requirements['auto_updates_readiness'] = [
     'title' => t('Update readiness checks'),
     'severity' => REQUIREMENT_OK,
     'value' => t('Your site is ready to for <a href=":readiness_checks">automatic updates</a>.', [':readiness_checks' => 'https://www.drupal.org/docs/8/update/automatic-updates#readiness-checks']),
   ];
-  $error_results = $checker->getResults(ReadinessCheckerManagerInterface::ERROR);
-  $warning_results = $checker->getResults(ReadinessCheckerManagerInterface::WARNING);
+  $error_results = $checker_manager->getResults(ReadinessCheckerManagerInterface::ERROR);
+  $warning_results = $checker_manager->getResults(ReadinessCheckerManagerInterface::WARNING);
   $checker_results = array_merge($error_results, $warning_results);
   if (!empty($checker_results)) {
     $requirements['auto_updates_readiness']['severity'] = $error_results ? REQUIREMENT_ERROR : REQUIREMENT_WARNING;
diff --git a/core/modules/auto_updates/auto_updates.module b/core/modules/auto_updates/auto_updates.module
index 71fd29dce1..7fec2f650f 100644
--- a/core/modules/auto_updates/auto_updates.module
+++ b/core/modules/auto_updates/auto_updates.module
@@ -39,16 +39,16 @@ function auto_updates_page_top(array &$page_top) {
         ':url' => $readiness_settings->toString(),
       ]));
     }
-    /** @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker */
-    $checker = \Drupal::service('auto_updates.readiness_checker');
-    $results = $checker->getResults(ReadinessCheckerManagerInterface::ERROR);
+    /** @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker_manager */
+    $checker_manager = \Drupal::service('auto_updates.readiness_checker');
+    $results = $checker_manager->getResults(ReadinessCheckerManagerInterface::ERROR);
     if ($results) {
       \Drupal::messenger()->addError(t('Your site is currently failing readiness checks for automatic updates. It cannot be <a href=":readiness_checks">automatically updated</a> until further action is performed:', [':readiness_checks' => 'https://www.drupal.org/docs/8/update/auto-updates#readiness-checks']));
       foreach ($results as $message) {
         \Drupal::messenger()->addError($message);
       }
     }
-    $results = $checker->getResults(ReadinessCheckerManagerInterface::WARNING);
+    $results = $checker_manager->getResults(ReadinessCheckerManagerInterface::WARNING);
     if ($results) {
       \Drupal::messenger()->addWarning(t('Your site does not pass some readiness checks for automatic updates. Depending on the nature of the failures, it might effect the eligibility for <a href=":readiness_checks">automatic updates</a>.', [':readiness_checks' => 'https://www.drupal.org/docs/8/update/auto-updates#readiness-checks']));
       foreach ($results as $message) {
@@ -71,9 +71,9 @@ function auto_updates_cron() {
     return;
   }
 
-  /** @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker */
-  $checker = \Drupal::service('auto_updates.readiness_checker');
-  $checker->run();
+  /** @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker_manager */
+  $checker_manager = \Drupal::service('auto_updates.readiness_checker');
+  $checker_manager->run();
 }
 
 /**
diff --git a/core/modules/auto_updates/src/Controller/ReadinessCheckerController.php b/core/modules/auto_updates/src/Controller/ReadinessCheckerController.php
index 1747228895..cd5ac996c5 100644
--- a/core/modules/auto_updates/src/Controller/ReadinessCheckerController.php
+++ b/core/modules/auto_updates/src/Controller/ReadinessCheckerController.php
@@ -20,18 +20,18 @@ class ReadinessCheckerController extends ControllerBase {
    *
    * @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface
    */
-  protected $checker;
+  protected $checkerManager;
 
   /**
    * ReadinessCheckerController constructor.
    *
-   * @param \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker
+   * @param \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface $checker_manager
    *   The readiness checker manager.
    * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
    *   The string translation service.
    */
-  public function __construct(ReadinessCheckerManagerInterface $checker, TranslationInterface $string_translation) {
-    $this->checker = $checker;
+  public function __construct(ReadinessCheckerManagerInterface $checker_manager, TranslationInterface $string_translation) {
+    $this->checkerManager = $checker_manager;
     $this->stringTranslation = $string_translation;
   }
 
@@ -52,7 +52,7 @@ public static function create(ContainerInterface $container) {
    *   A redirect to the automatic updates settings page.
    */
   public function run() {
-    if (!array_filter($this->checker->run())) {
+    if (!array_filter($this->checkerManager->run())) {
       $this->messenger()->addStatus($this->t('No issues found. Your site is ready for <a href=":readiness_checks">automatic updates</a>.', [':readiness_checks' => 'https://www.drupal.org/docs/8/update/auto-updates#readiness-checks']));
     }
     return $this->redirect('auto_updates.settings');
diff --git a/core/modules/auto_updates/src/Form/SettingsForm.php b/core/modules/auto_updates/src/Form/SettingsForm.php
index 45539d65e2..a88eaaf14f 100644
--- a/core/modules/auto_updates/src/Form/SettingsForm.php
+++ b/core/modules/auto_updates/src/Form/SettingsForm.php
@@ -17,7 +17,7 @@ class SettingsForm extends ConfigFormBase {
    *
    * @var \Drupal\auto_updates\ReadinessChecker\ReadinessCheckerManagerInterface
    */
-  protected $checker;
+  protected $checkerManager;
 
   /**
    * The date formatter.
@@ -31,7 +31,7 @@ class SettingsForm extends ConfigFormBase {
    */
   public static function create(ContainerInterface $container) {
     $instance = parent::create($container);
-    $instance->checker = $container->get('auto_updates.readiness_checker');
+    $instance->checkerManager = $container->get('auto_updates.readiness_checker');
     $instance->dateFormatter = $container->get('date.formatter');
     return $instance;
   }
@@ -64,13 +64,13 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#open' => TRUE,
     ];
 
-    $last_check_timestamp = $this->checker->timestamp();
+    $last_check_timestamp = $this->checkerManager->timestamp();
     $form['readiness']['enable_readiness_checks'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Check the readiness of automatically updating the site.'),
       '#default_value' => $config->get('enable_readiness_checks'),
     ];
-    if ($this->checker->isEnabled()) {
+    if ($this->checkerManager->isEnabled()) {
       $readiness_messages = $last_check_timestamp === NULL ?
         $this->t('Readiness checks have never been run.')
         : $this->t('Readiness checks were last run @time ago.', ['@time' => $this->dateFormatter->formatTimeDiffSince($last_check_timestamp)]);