7. Take a look at this plugin: http://forums.alliedmods.net/showthread.php?p=138613. In the description, the author says: This basically alerts everyone that the server is shutting down, then countsdown from 10 to 1, then restarts the server, and makes everyone auto reconnect to your server." I don't know if it actually works, haven't tried that...
That plugin worked when you told the server to restart by a specific command, not when it crashed. Plus, Valve has blocked the ability to force players to connect to servers
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