IPAM has supported ISC DHCP for a while. However, ISC now recommends that all new DHCP implementations use Kea. Kea is not new, it has been available for several years now. I was disappointed to see that my implementation of 10 new DHCP servers using Kea was not supported by my Solarwinds IPAM deployment. It's not a deal breaker, but it has forced me to start looking into other software to monitor/manage DHCP.
Please consider this a feature request to integrate Kea DHCP into Solarwinds.