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The Admin Interface will check if the version of the MC database matches the version of the Admin Interface. For example in the following example the database was upgraded to v2020.02 but the Admin Interface is still running a 2019.02 version. The warning will remain on top of the screen until the versions match.
Version page for load balancers: /version
In case a loadbalancer (like Azure Application Gateway) is put in front of the admin interface that require a health check, it is important to use the "/version" URL. This URL will return a HTML page without creating a new session or database connection.