Merge pull request #48743 from sabrinajess/CNV20102

CNV20102: new upgrade doc note for NMO

Author: sjhala-ccs

virt/upgrading-virt.adoc

@@ -8,6 +8,16 @@ toc::[]
 
 Learn how Operator Lifecycle Manager (OLM) delivers z-stream and minor version updates for {VirtProductName}.
 
+[NOTE]
+====
+* The Node Maintenance Operator (NMO) is no longer shipped with {VirtProductName}. You can xref:../nodes/nodes/eco-node-maintenance-operator.adoc#node-maintenance-operator[install the NMO] from the *OperatorHub* in the {product-title} web console, or by using the OpenShift CLI (`oc`).
++
+You must perform one of the following tasks before updating to {VirtProductName} 4.11 from {VirtProductName} 4.10.2 and later releases:
+
+** Move all nodes out of maintenance mode.
+** Install the standalone NMO and replace the `nodemaintenances.nodemaintenance.kubevirt.io` custom resource (CR) with a `nodemaintenances.nodemaintenance.medik8s.io` CR.
+====
+
 include::modules/virt-about-upgrading-virt.adoc[leveloffset=+1]
 
 [id="configuring-workload-updates_upgrading-virt"]