Duplicate entries for the same host where some entries have NULL IP address

Document ID : KB000106145
Last Modified Date : 14/08/2018
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Introduction:
Several robots have multiple device entries in the UIM database CM_COMPUTER_SYSTEM table resulting in duplicate entries in the UMP USM portlet for these devices.  For most of these duplciates, the IP address field is NULL.
Question:
If application discovery is configured, some 7.93 robots end up with duplicate entries in the CM_COMPUTER_SYSTEM table because the IP address column is NULL.  What is the procedure for eliminating the duplicate entries?
Environment:
UIM 8.5.1 SP1
Hub 7.93
Robot 7.93
discovery_server 8.52
Answer:
This is a known issue with early robot_update 7.93 releases.  This is corrected in the 7.93HF5 hot fix and later releases located on the CA UIM Hot Fix Index site:

CA Unified Infrastructure Management Hotfix Index​

Deploy the 7.93HF5 or later release of the robot_upate package to all robots where you have duplicates.
Cold start (deactivate, then activate) the discovery_server probe once all robots have been upgraded to force the recorrelation of the duplicate device entries.