add information on running conifg apply after upgrade a node (#58180)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Manuel Bergler <manue1@github.com>
Co-authored-by: mc <42146119+mchammer01@users.noreply.github.com>

Author: 4 people

content/admin/upgrading-your-instance/performing-an-upgrade/upgrading-with-an-upgrade-package.md

@@ -60,6 +60,9 @@ While you can use a hotpatch to upgrade to the latest patch release within a fea
    tail -f /data/user/common/ghe-config.log
    ```
 
+   The configuration runs in the background and you don't need to run `ghe-config-apply` explicitly unless you encounter a problem.
+   > [!WARNING] If you are upgrading a node in a multi-node cluster, running `ghe-config-apply` on the command line or saving settings in the {% data variables.enterprise.management_console %} may fail and result in an incomplete upgrade if not all the nodes are upgraded to the same version. Please use `ghe-single-config-apply` instead.
+
 1. Optionally, after the upgrade, validate the upgrade by configuring an IP exception list to allow access to a specified list of IP addresses. See [AUTOTITLE](/admin/configuration/configuring-your-enterprise/enabling-and-scheduling-maintenance-mode#validating-changes-in-maintenance-mode-using-the-ip-exception-list).
 1. For single node upgrades, perform any post-upgrade tasks including disabling maintenance mode so users can use {% data variables.location.product_location %}.