Hi all,
A translatable message in the event of the network status message is displayed on the client area as part of the Twenty One theme. There are different messages for scheduled and impacting issues. Check it out: https://blog.whmcs.com/133659/introducing-the-twenty-one-theme

There's a variable available $openNetworkIssueCounts which could be used to add some additional contextual notices on other pages within the client area.