Stale DNS names are not cleaned up by ACC-VDescriptionStale records for DNS names for a given CI is not cleaned up which are discovered by ACC-V.Following are the tables cmdb_ci_dns_name2. cmdb_ip_address_dns_nameSteps to Reproduce Setup an agent on a Windows or Linux machine2. Collect host data3. Notice DNS name getting collected4. Notice table 'cmdb_ci_dns_name' and 'cmdb_ip_address_dns_name' being populated5. Remove one DNS from the target machine6. Collect host data again- Notice that removed DNS is still present in both tables 'cmdb_ci_dns_name' and 'cmdb_ip_address_dns_name'WorkaroundIf you are able to upgrade, review the Fixed In section to determine the latest version with a permanent fix your instance can be upgraded to.Related Problem: PRB1582131