code: public function check($alias = null)
      {
          if (null === $alias) {
              $statuses = new Statuses;
              $statuses->setHealthy(true);
  
              foreach ($this->checkCollection as $check) {
                  $status = $check->execute();
                  $statuses->getCollection()->add($status);
  
                  if (!$status->getHealthy()) {
                      $statuses->setHealthy(false);
                  }
              }
  
              return $statuses;
          } else {
              $check = $this->checkCollection->filter(function($element) use($alias) {
                  return $element->getAlias() === $alias;
              })->first();
  
              if (!$check) {
                  throw new InvalidAliasException('Check alias does not exist.');
              }
  
              $status = $check->execute();
  
              return $status;
          }
      }
docs: Run health checks
  
  @param string $alias
  @return \Ds\Component\Health\Model\Statuses|\Ds\Component\Health\Model\Status
  @throws \Ds\Component\Health\Exception\InvalidAliasException