Add a Note about base os management and old bootstrap scripts (#3044)

* Add a note about base os management and bootstrap scripts
* Only for suma
Co-authored-by: Karl Eichwalder <ke@suse.de>

modules/client-configuration/pages/registration-bootstrap.adoc

@@ -20,12 +20,14 @@ For more information about creating a bootstrap repository, see xref:client-conf
 ====
 
 ifeval::[{uyuni-content} == true]
+
 [IMPORTANT]
 .GPG Keys and Uyuni Client Tools
 ====
 The GPG key used by Uyuni Client Tools is not trusted by default.
 When you create your bootstrap script, add a path to the file containing the public key fingerprint with the [systemitem]``ORG_GPG_KEY`` parameter.
 ====
+
 endif::[]
 
 [NOTE]
@@ -35,6 +37,15 @@ Bootstrap scripts based on Python 2 must be re-created for openSUSE Leap 15 an
 If you register openSUSE Leap 15 or SLE 15 systems using Python 2, the bootstrap script fails.
 ====
 
+ifeval::[{suma-content} == true]
+
+[IMPORTANT]
+====
+After migrating from an older version of {productname} to a newer version, we strongly recommend re-generating the bootstrap scripts before onboarding new systems to prevent any potential issues.
+====
+
+endif::[]
+
 
 
 [[registering.clients.bootstrap.mgr-bootstrap]]
@@ -71,6 +82,7 @@ You can use the {productname} {webui} to create an editable bootstrap script.
 . The bootstrap script is generated and stored on the server in the [path]``/srv/www/htdocs/pub/bootstrap`` directory.
   Alternatively, you can access the bootstrap script over HTTPS.
   Replace [literal]``<example.com>`` with the host name of your {productname} Server:
++
 ----
 https://<example.com>/pub/bootstrap/bootstrap.sh
 ----

modules/client-configuration/pages/registration-overview.adoc

@@ -14,7 +14,18 @@ Before you begin, check that:
 
 [IMPORTANT]
 ====
-Do not register the {productname} Server to itself.
-The {productname} Server must be managed individually or by using another separate {productname} Server.
-For more information about using multiple servers, see xref:specialized-guides:large-deployments/hub-multi-server.adoc[].
+Do not register the {productname} Server base OS to {productname} itself.
+The {productname} Server base OS must be managed individually or by using another separate {productname} Server.
+
+To manage {productname} Server Containers, use the [literal]``mgradm`` tool.
+
+====
+
+ifeval::[{suma-content} == true]
+
+[IMPORTANT]
 ====
+After migrating from an older version of {productname} to a newer version, we strongly recommend re-generating the bootstrap scripts before onboarding new systems to prevent any potential issues.
+====
+
+endif::[]