bxen02 died, with it went releng01, relepel1, nfs1, koji1 and the signing bridge.
/var/log/messages was less then helpful:
Feb 23 18:21:33 bxen02 puppetd: Finished catalog run in 31.54 seconds
Feb 23 18:40:25 bxen02 syslogd 1.4.1: restart (remote reception).
It came back up just fine, we're keeping an eye on it to see what happened.
bxen02's been solid since it was down. I think it was a lose power cable.
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