Comment 1 for bug 1683496

Note for QA engineers:
Before reproducing the bug, API rate limits should be enabled by adding the ratelimit filter in [composite:openstack_compute_api_v21] section (for mitaka) in the nova api-paste.ini:

...
[composite:openstack_compute_api_v21]
use = call:nova.api.auth:pipeline_factory_v21
noauth2 = cors compute_req_id faultwrap sizelimit noauth2 osapi_compute_app_v21
keystone = cors compute_req_id faultwrap sizelimit authtoken keystonecontext ratelimit osapi_compute_app_v21
...

For outher versions 'ratelimit' filter may need additions to other sections of the nova api-paste.ini