Send notification to the user if the connection to the backend can't be established

As a end user I want to know if the connection to the backend will start failing

So that I'm aware about the problem and I start to investigate the root cause

Case the connection to the backend has been broken in certain period of time (e.g. 12 or 24 hours)

On-premises online users

• Function to on-premises server which will notify the user e.g. via email

Cloud users

• Function to client API which will give the notification to the used product that e.g. the renewal hasn't been successful during the period of time.
• When there's only e.g. one day left to license expiration, the notification should be message box which will require user interaction (e.g. message and OK button)