BZ1872476: added note to check resources are uninstalled

Author: skrthomas

modules/installation-uninstall-clouds.adoc

@@ -11,6 +11,9 @@
 ifeval::["{context}" == "uninstalling-cluster-aws"]
 :aws:
 endif::[]
+ifeval::["{context}" == "uninstalling-cluster-gcp"]
+:gcp:
+endif::[]
 
 [id="installation-uninstall-clouds_{context}"]
 = Removing a cluster that uses installer-provisioned infrastructure
@@ -25,6 +28,14 @@ If you deployed your cluster to the AWS C2S Secret Region, the installation prog
 ====
 endif::aws[]
 
+[NOTE]
+====
+After uninstallation, check your cloud provider for any resources not removed properly, especially with User Provisioned Infrastructure (UPI) clusters. There might be resources that the installer did not create or that the installer is unable to access.
+ifdef::gcp[]
+For example, some Google Cloud resources require link:https://cloud.google.com/iam/docs/overview#concepts_related_to_access_management[IAM permissions] in shared VPC host projects, or there might be unused link:https://cloud.google.com/sdk/gcloud/reference/compute/health-checks/delete[health checks that must be deleted].
+endif::gcp[]
+====
+
 .Prerequisites
 
 * Have a copy of the installation program that you used to deploy the cluster.