Phlogiston.wmflabs.org was unresponsive by browser this morning (last time I'm sure it was up was middle of last week). It didn't respond to ssh. https://wikitech.wikimedia.org/wiki/Special:NovaInstance showed active but "get console output" returned blank.
I clicked REBOOT, and now it is in state ERROR; web browsing returns a 502, and ssh fails with "no route to host". "Get console output is still blank".