How do I find services?
A better way to accomplish this is to use the Drupal Console's  container:debug command. This command outputs a list of Drupal service ID's and its corresponding namespace &amp; class.

$drupal container:debug  

 Service ID                 Class Name
 class_loader               Symfony\Component\ClassLoader\ApcClassLoader
 kernel                     Drupal\Core\DrupalKernel
 service_container          Drupal\Core\DependencyInjection\Container
 cache_context.ip           Drupal\Core\Cache\Context\IpCacheContext
 cache_context.headers      Drupal\Core\Cache\Context\HeadersCacheContext
 cache_context.cookies      Drupal\Core\Cache\Context\CookiesCacheContext
 ...


This command can be employed along with grep to search for a specific class name or service ID. For example: drupal container:debug | ag 'DatabaseStorage' to find a DatabaseStorage class.

Also of interest is the PhpStorm / IntelliJ Drupal Symfony Bridge plugin if you use PHPStorm.