Update some legacy documentation with up-to-date info

Author: Jonathan Visser

docs/about-hypernode/about-hypernode/upgrade-to-debian-buster-technical-implications.md

@@ -60,7 +60,7 @@ n98-magerun2 sys:maintenance --off
 
 ### Additional Information
 
-For additional information, take a look at the [Magento 2 documentation about enabling the maintenance mode.](https://devdocs.magento.com/guides/v2.3/install-gde/install/cli/install-cli-subcommands-maint.html)
+For additional information, see the Magento 2 documentation on maintenance mode (bin/magento maintenance) on Experience League.
 
 ## Serve a Custom Error Message When in Maintenance Mode
 

docs/ecommerce-applications/magento-2/how-to-enable-the-maintenance-mode-in-magento-2.md

@@ -289,6 +289,10 @@ Remember to update your `~/.my.cnf` with your new password so you could easily l
 
 ## How to Upgrade Your MySQL Version
 
+```{note}
+Updated 2025: New Hypernodes default to MySQL 8.0 or newer. The 5.6/5.7 sections below are historical and only apply to older stacks.
+```
+
 ### Upgrading to MySQL 5.7
 
 **Please note that once you have upgraded the MySQL version on your Hypernode, you won't be able to downgrade it.**

docs/hypernode-platform/mysql/how-to-use-mysql-on-hypernode.md

@@ -14,9 +14,9 @@ redirect_from:
 
 Customers with a Trial, Pelican M (or up), Falcon S (or up) or Eagle plan can use Varnish to boost the performance of their application. After enabling Varnish, you still need to configure both Varnish and your application. We have [support documentation per application](../varnish/how-to-enable-varnish-on-hypernode.md#configure-varnish-on-your-application) available to guide you through the process:
 
-## Enable Varnish 4.0 or 6.0
+## Enable Varnish 4.0, 6.0 or 7.x
 
-At Hypernode it’s possible to enable Varnish 4.0 or 6.0 via the Control Panel, Service Panel or CLI. The Varnish version needed depends on the application version you’re running.
+At Hypernode it’s possible to enable Varnish 4.0, 6.0 or 7.x via the Control Panel, Service Panel or CLI. The Varnish version needed depends on the application version you’re running.
 
 **Enable Varnish via the [Control Panel](https://auth.hypernode.com/)**
 
@@ -26,14 +26,15 @@ At Hypernode it’s possible to enable Varnish 4.0 or 6.0 via the Control Panel,
 - Click on "Enable Varnish"
 
 **Configure Varnish 6.0 via the [hypernode-systemctl tool](../tools/how-to-use-the-hypernode-systemctl-cli-tool.md)**
-
 `hypernode-systemctl settings varnish_version 6.0`
 
 **Or if you want to switch to Varnish 4.0**
 `hypernode-systemctl settings varnish_version 4.0`
 
-**Enable Varnish via the [hypernode-systemctl tool](../tools/how-to-use-the-hypernode-systemctl-cli-tool.md)**
+**Or configure Varnish 7.x**
+`hypernode-systemctl settings varnish_version 7.x`
 
+**Enable Varnish via the [hypernode-systemctl tool](../tools/how-to-use-the-hypernode-systemctl-cli-tool.md)**
 `hypernode-systemctl settings varnish_enabled true`
 
 ## Configure Varnish on the Vhost