opal8.opalstack.com (San Francisco shared hosting) became non-responsive at 3:30 PM US/Pacific time. We suspected a temporary high load condition, but after several minutes the server remained unresponsive. At that point we decided to reboot the server.
The server is online and operating normally at this time. We'll work to identify the site which caused the high load and will then work with that customer to guard against future incidents.