Any plugin dependent on a DaemonSet needs to be able to reference the HostIP to be able to interface with the dependent service (Datadog Plugin is the primary use case for this requirement)
Datadog Agent no longer supports Deployments with attached Services and instead only offers a DaemonSet. The Kong Datadog Plugin
host field will be required to point to the HostIP to send metrics to dogstatsd.
If there is an alternative working solution to being able to reference HostIP variables in the KongPlugin CRD I would be open to that as well.