When a machine gets a new IP address from DHCP, this server register an reverse record on DNS, but when the lease is gone it's not removed from DNS, leading to lots of garbage data on the DNS. Those stale records eventually cause long zone transfers, unnecessary disk usage, and outdated host information and at last degrade servers performance.

We could add a mechanism to clean up and remove stale dynamically updated DNS records.

Originally reported for bind-dyndb-ldap: https://bugzilla.redhat.com/show_bug.cgi?id=1460576