FWIW, I'll probably already be on top of it as I've implemented robust Nagios monitoring that triggers SMS notifications to my phone when anything goes wrong. If the site goes down for 5 minutes or the blockchain stops updating for more than 2 hours my phone will be lighting up.
Also, I've put in quite a bit of effort to make sure the next downtime we have will be due to hardware failure rather than a software or operating system issue. All the site's key services are monitored by systemd and set to restart automatically if they leak too much memory or go down.
Thank you for notifying us liraz, where should we report when it happens again?