OCPBUGS-59147#Add RN for extended loopback cert validity for kube-apiserver

Author: amolnar-gh

release_notes/ocp-4-15-release-notes.adoc

@@ -1196,6 +1196,12 @@ When making changes to your worker nodes through a machine config, the changes a
 
 With this update, machine config changes made to a custom node take precedence over machine config changes made to a worker node, regardless of the machine config names. 
 
+[discrete]
+[id="ocp-4-15-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-4-15-deprecated-removed-features"]
 == Deprecated and removed features