The short version: a power outage in the data center caused almost 9 hours of downtime last night. Apologies for the inconvenience.

At about 6:30PM (pacific time) yesterday there was a power outage in the datacenter where the YLF servers live. They have backup generators, so all should have been ok, but one of the generators failed. It took about 5 hours to get the power restored, and then another 3 hours or so to repair the damage caused by the power failure.

But YLF is running again and all seems to be well.