Add note on systemvm upgrade changes

Author: Pearl1594

source/installguide/management-server/_systemvm.rst

@@ -16,6 +16,9 @@
 Prepare the System VM Template
 ------------------------------
 
+From Apache CloudStack v4.16 onwards, upgrade path handles systemVM template registration, if not done prior to initiating upgrade.
+One may choose, to also omit the systemVM template seeding step during fresh installation of CloudStack, as support has been added to 
+initiate systemVM template registration for all hypervisors present in the zone when the first secondary storage pool is added.
 Secondary storage must be seeded with a template that is used for
 CloudStack system VMs.
 

source/plugins/cloudstack-kubernetes-service.rst

@@ -40,6 +40,9 @@ Restart the Management Server to enable the set configuration values.
 
 Once the Kubernetes service is running the new APIs will become accessible and the UI will show the Kubernetes tab under the Compute section.
 
+**NOTE:**
+From ACS 4.16 onwards, if a CKS cluster is to be deployed on VMware, the 'vmware.create.full.clone' configuration parameter will need to be set to true, so as to allow resizing of root volumes of the cluster nodes.
+
 Kubernetes Supported Versions
 ------------------------------
 

source/upgrading/index.rst

@@ -28,6 +28,12 @@ Upgrading CloudStack
 This document contains the instructions for upgrading CloudStack from prior releases, to the current 
 release.  Please read through all sections carefully before starting.
 
+From ACS 4.16 onwards, seeding of system-VM template is optional, as this will be taken care of by either the upgrade process or
+in case of a fresh deployment, registration of the systemVM template(s) is handled during the addition of the first image store to a zone.
+The `cloudstack-management` package will now include the systemVM templates for KVM, XenServer and VMWare. In case templates aren't already registered
+either prior upgrade or during fresh installation, ACS will handle the template registration automatically, by mounting the secondary store onto the 
+management server, copying the respective templates to the store and then creating the `template.properties` file.
+
 .. note::
    For information on the API changes and issues fixed in this release, please see the Release Notes section of the documentation
 

source/upgrading/upgrade/_sysvm_templates.rst

@@ -28,7 +28,11 @@ Update System-VM templates
 #. Click Register template.
    The Register template dialog box is displayed.
 
-#. In the Register template dialog box, specify the following values
+#. From ACS 4.16 onwards, CloudStack will support automatic registration of systemVM
+   templates, if not done prior initiating upgrade. However, the usual upgrade process 
+   continues to be supported. To register the system VM template do the following:
+
+   In the Register template dialog box, specify the following values
    (do not change these):
 
    .. cssclass:: table-striped table-bordered table-hover