NullLogger example

  }

  /** * Invokes any cron handlers implementing hook_cron. */
  protected function invokeCronHandlers() {
    $module_previous = '';

    // If detailed logging isn't enabled, don't log individual execution times.     $time_logging_enabled = \Drupal::config('system.cron')->get('logging');
    $logger = $time_logging_enabled ? $this->logger : new NullLogger();

    // Iterate through the modules calling their cron handlers (if any):     $this->moduleHandler->invokeAllWith('cron', function Dcallable $hook, string $module) use (&$module_previous, $logger) {
      if (!$module_previous) {
        $logger->info('Starting execution of @module_cron().', [
          '@module' => $module,
        ]);
      }
      else {
        $logger->info('Starting execution of @module_cron(), execution of @module_previous_cron() took @time.', [
          '@module' => $module,