To retrieve volume-oriented events and samples, you must configure the Block Storage service to send notifications to the message bus. Perform these steps on the controller and storage nodes. Edit the /etc/cinder/cinder.conf file and complete the following actions: In the [DEFAULT] section, configure notifications: [DEFAULT] ... control_exchange = cinder notification_driver = messagingv2 Restart the Block Storage services on the controller node: # service cinder-api restart # service cinder-scheduler restart # systemctl restart openstack-cinder-api.service openstack-cinder-scheduler.service Restart the Block Storage services on the storage nodes: # service cinder-volume restart # systemctl restart openstack-cinder-volume.service Use the cinder-volume-usage-audit command to retrieve metrics on demand. For more information, see Block Storage audit script setup to get notifications.