I was asked to add a maintenance page to a critical product when updating the system! Adding maintenance page is a type of additional induced downtime!! What u

I was asked to add a maintenance page to a critical product when updating the system! Adding maintenance page is a type of additional induced downtime!! What u need to do is just do the needed update, and any downtime goes from your downtime credit. Maybe inform that not all services will be up and site performance may be sub-optimal. Best if you can simulate the updates on a test environment beforehand!