OCPBUGS-56835#Add RN for extended loopback cert validity for kube-apiserver

Author: amolnar-rh

release_notes/ocp-4-18-release-notes.adoc

@@ -1320,6 +1320,12 @@ If you have Operator projects that were previously created or maintained with Op
 
 * xref:../operators/operator_sdk/helm/osdk-helm-updating-projects.adoc#osdk-upgrading-projects_osdk-helm-updating-projects[Updating Helm-based Operator projects]
 
+[discrete]
+[id="ocp-4-18-notable-technical-changes-loopback-cert_{context}"]
+=== Extended loopback certificate validity to three years for kube-apiserver
+
+Previously, the self-signed loopback certificate for the Kubernetes API Server expired after one year. With this release, the expiration date of the certificate is extended to three years.
+
 [id="ocp-4-18-deprecated-removed-features_{context}"]
 == Deprecated and removed features