We need to know which user added /delete the device. Is it possible to find out?.
Dx NetOps Performance Management any version
There is no auditing to determine who deleted or added a device. There is the /opt/IMDataAggregator/apache-karaf-2.4.3/data.bak/log/ItemDeletes.log but that only helps if you know the item id, and it will only show when a device was deleted