Device deletion blacklist does not prevent alarms

Document ID : KB000112307
Last Modified Date : 28/08/2018
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when a device is deleted in USM with prevent rediscovery the blacklist should prevent the following 

rediscovery of device by discovery_server 
publication of QOS by data_engine 
publication of alarms by NAS 

however we have seen that new alarms are generated after the device is deleted
There is no permanent solution at this time.  The issue is currently being researched.  Additional information will be provided as it becomes available. 
Additional Information:
case 1172114