[enterprise-4.20] : Updated how to add control planes to BM Postinstall docs

_topic_maps/_topic_map.yml

@@ -2440,6 +2440,8 @@ Topics:
     File: cpmso-troubleshooting
   - Name: Disabling the control plane machine set
     File: cpmso-disabling
+  - Name: Manually scaling control plane machines
+    File: cpmso-manually-scaling-control-planes
 - Name: Managing machines with the Cluster API
   Dir: cluster_api_machine_management
   Topics:

machine_management/control_plane_machine_management/cpmso-manually-scaling-control-planes.adoc

@@ -0,0 +1,17 @@
+:_mod-docs-content-type: ASSEMBLY
+[id="cpmso-manually-scaling-control-planes"]
+= Manually scaling control plane machines
+include::_attributes/common-attributes.adoc[]
+:context: cpmso-manually-scaling-control-planes
+
+toc::[]
+
+When installing a cluster on bare-metal infrastructure, you can manually scale up to 4 or 5 control plane nodes for your cluster. Consider this use case in situations where you need to recover your cluster from a degraded state, perform deep-level debugging, or ensure stability and security of the control planes in complex scenarios.
+
+[IMPORTANT]
+====
+Red{nbsp}Hat supports a cluster that has 4 or 5 control plane nodes only on bare-metal infrastructure.
+====
+
+// Adding a control plane node to your cluster
+include::modules/creating-control-plane-node.adoc[leveloffset=+1]