Add status check for auth endpoint

health/services.py

@@ -1,5 +1,5 @@
 import logging
-from app import build_logs, storage
+from app import build_logs, storage, authentication
 from health.models_pre_oci import pre_oci_model as model
 
 logger = logging.getLogger(__name__)
@@ -46,12 +46,18 @@ def _check_storage(app):
     logger.exception('Storage check failed with exception %s', ex)
     return False
 
+def _check_auth(app):
+  """ Returns the status of the auth engine, as accessed from this instance. """
+  (status, _) = authentication.ping()
+  return status
+
 
 _SERVICES = {
   'registry_gunicorn': _check_registry_gunicorn,
   'database': _check_database,
   'redis': _check_redis,
   'storage': _check_storage,
+  'auth': _check_auth,
 }
 
 def check_all_services(app, skip):