The discovery_agent probe has been deployed by mistake to a few robots.
How to remove unwanted discovery_agent from USM so they do not show as a node under Inventory and are not available in Discovery Wizard?
UIM 8.x or above
After deleting the discovery_agent probe from the unwanted robots it will need to be removed from the database with the following commands:
select * from CM_DISCOVERY_AGENT
call P_CM_REMOVE_DISCOVERY_AGENT(da_id from previous query)
Note: this will remove the scopes associated with that discovery_agent.
Simply refresh USM and the unwanted discovery_agent should now be gone.