The status of the DDS nodes that you are referring to, is part of Cassandra.
Cassandra exposes management operations through Java Management Extensions (JMX). The D-Node makes these operations accessible to system administrators and external tools. You can use the Cassandra nodetool utility to manage and monitor a cluster, run commands to view detailed metrics for tables, servers, network/disk/CPU utilization, and read/write latency histograms. You can configure monitoring tools such as DataStax OPSCenter, Nagios, or Monit to monitor the services infrastructure. For more information about the nodetool utility, see the DataStax documentation for Cassandra.