OSDOCS-14689:adding RN for custom DNS

Author: brendan-daly-red-hat

release_notes/ocp-4-19-release-notes.adoc

@@ -449,6 +449,12 @@ In {product-title} {product-version}, the installation program uses the Cluster
 On 30 September 2025, the default outbound access connectivity for all new virtual machines (VMs) in {azure-first} will be retired. To enhance security, {azure-short} is moving towards a secure-by-default model where default outbound access to the internet will be turned off. However, configuration changes to {product-title} are not required. By default, the installation program creates an outbound rule for the load balancer.
 
 For more information, see link:https://azure.microsoft.com/en-us/updates?id=default-outbound-access-for-vms-in-azure-will-be-retired-updates-and-more-information[Azure Updates] (Microsoft documentation), link:https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-outbound-connections#scenarios[Azure's outbound connectivity methods] (Microsoft documentation), and xref:../installing/installing_azure/upi/installing-azure-preparing-upi.adoc#installing-azure-preparing-upi[Preparing to install a cluster on {azure-short}].
+[id="ocp-4-19-GCP-custom-dns_{context}"]
+==== Installing a cluster on {gcp-first} with a user-provisioned DNS
+
+With this release, you can enable a user-provisioned domain name server (DNS) instead of the default cluster-provisioned DNS solution. For example, your organization's security policies might not allow the use of public DNS services such as Google Cloud DNS. You can manage your DNS only for the IP addresses of the API and Ingress servers. If you use this feature, you must provide your own DNS solution that includes records for `api.<cluster_name>.<base_domain>.` and `*.apps.<cluster_name>.<base_domain>.`.
+
+For more information, see xref:../installing/installing_gcp/installing-gcp-customizations.adoc#installation-gcp-enabling-user-managed-DNS_installing-gcp-customizations[Enabling user-managed DNS].
 
 [id="ocp-4-19-admin-ack-updating_{context}"]
 ==== Required administrator acknowledgment when updating from {product-title} 4.18 to 4.19