We are receiving alerts from servers that we have already removed.
Access the machine/system via SSH and if the system will be decommissioned and you don't need the files for any reason,
1. Stop the robot if it's still running
2. Delete the /opt/nimsoft folder (or wherever the install directory (path) is located)
3. Acknowledge (delete) all of the current 'Disk Missing' alarms
4. Then check processes using ps - aux | grep nim and ensure there are no leftover Nimbus processes
5. If so, run a kill -9 <pid> on the parent process/processes