Graceful shutdown handling in UI

When shutting down Confluence for administrative purposes, it's very likely there's users logged in who are editing some pages. I currently have a process of pre-warning people over email a couple times but processes which rely on people generally don't work that well. Also I can't run around the office telling people I'm shutting the software down since there's 17 offices using Confluence.

Please consider the following improvement: Confluence administrators should be able to switch Confluence into "shutdown mode". In this mode, new user sessions should be prevented and everyone with an active session should see a standard "system is going down" message along with a message written by the administrator. Of course allow saving pages but maybe prevent opening new pages for editing?

This would make Confluence a lot more "enterprise friendly". I've reported similar issue for Jira (JRA-3325) which unfortunately hasn't been implemented.