chore(25.3.0): Add DNS lookup perfomance improvements

Author: Techassi

modules/ROOT/partials/release-notes/release-25.3.adoc

@@ -33,7 +33,9 @@ See https://github.com/stackabletech/docker-images/pull/943[docker-images#943].
 
 ==== Platform improvements
 
-General::
+===== General
+
+====== OCI Registry
 
 Starting with this release, our OCI registry located at `oci.stackable.tech` was promoted to stable.
 This means that our operators, the product image selection and tools will use the registry by default instead of the previous Docker repository located at `docker.stackable.tech`.
@@ -59,6 +61,12 @@ $ helm repo update stackable-stable
 $ helm install --wait airflow-operator stackable-stable/airflow-operator --version 25.3 --set image.repository=docker.stackable.tech/stackable/airflow-operator
 ----
 
+====== DNS lookup performance
+
+Users can now opt-in to experimental support for improved DNS performance by specifying a fully qualified domain name (with a trailing dot) as Kubernetes cluster domain for our operators.
+This can reduce the amount of DNS queries within the cluster, but might have side effects, hence we consider the support experimental for now.
+Take a look at xref:guides:kubernetes-cluster-domain.adoc[our documentation] to find out how to enable this improvement.
+
 Authorization::
 
 OPA Rego rules no longer require the `future.keywords` import.