Is there a page redirect Mechanism within the IAM to place a message when the published application is down, either for maintenance , platform upgrade, application upgrade etc….

What I’m looking for is a way not to go manually and replace the index.html file of the Universal GUI with another  that has as an example message  ‘Be Back Soon, we are upgrading our systems’ and then also bounce the App service.

Our published application will be accessed from all timezones and keeping such activities to certain time frame will not be possible as there will always be someone wanting to access the App.