make configcheck passes

celery/app/defaults.py

@@ -141,6 +141,7 @@ NAMESPACES = {
         'RESULT_EXCHANGE_TYPE': Option('direct'),
         'RESULT_SERIALIZER': Option('json'),
         'RESULT_PERSISTENT': Option(None, type='bool'),
+        'RIAK_BACKEND_SETTINGS': Option(type='dict'),
         'ROUTES': Option(type='any'),
         'SEND_EVENTS': Option(False, type='bool'),
         'SEND_TASK_ERROR_EMAILS': Option(False, type='bool'),

docs/configuration.rst

@@ -1256,6 +1256,8 @@ This is the total number of results to cache before older results are evicted.
 The default is 5000.  0 or None means no limit, and a value of :const:`-1`
 will disable the cache.
 
+.. setting:: CELERY_TRACK_STARTED
+
 CELERY_TRACK_STARTED
 ~~~~~~~~~~~~~~~~~~~~