OSDOCS-7985: Adding warning about scaling to 0

Author: bergerhoffer

modules/dr-hosted-cluster-within-aws-region-delete.adoc

@@ -21,6 +21,13 @@ Ensure that the `kubeconfig` file of the destination management cluster is place
 
 . Scale the `deployment` and `statefulset` objects by entering these commands:
 +
+[IMPORTANT]
+====
+Do not scale the stateful set if the value of its `spec.persistentVolumeClaimRetentionPolicy.whenScaled` field is set to `Delete`, because this could lead to a loss of data.
+
+As a workaround, update the value of the `spec.persistentVolumeClaimRetentionPolicy.whenScaled` field to `Retain`. Ensure that no controllers exist that reconcile the stateful set and would return the value back to `Delete`, which could lead to a loss of data.
+====
++
 [source,terminal]
 ----
 # Just in case