With 2.1.0p7 and werk #14281 we changed the system Apache configuration which
broke the System Apache error page that is shown to the user in case the site
Apache is not running. It showed a 'Service Unavailable' message instead of the
intended 'Checkmk: Site Not Started'.
To apply this fix, you will have to execute omd update-apache-config [site]
as root user after executing omd update.
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