I have like 8 different SNMPv3 credentials when I scan for different devices on the network because not all device have the same level of security and I have to make a different credential for it. The problem is I go back months later and want to delete a credential but it WILL NOT DELETE until you delete the devices that the CREDENTIAL used to get the device added to the NPM db. I was told by solarwinds that they don't have anything in place to display or report what devices used what snmpv3 credentials, there is a field that does tell you what SNMP version was used but not what snmp credential was used.