This looks to be some sort of change in koji or the builders is causing this page. The check is to see if x86-01 appears on the website
http://koji.fedoraproject.org/koji/hosts
however none of the builders x86-01 -> x86-08 show up currently. The systems seem to be active and running but not listed in koji at the moment.
---------- Forwarded message ---------- From: Nagios Monitoring User nagios@fedoraproject.org Date: Sat, Jul 24, 2010 at 06:18 Subject: PROBLEM: koji01.phx2.fedoraproject.org/koji is CRITICAL
Service: koji Host: koji01 Info: HTTP CRITICAL: HTTP/1.1 200 OK - string not found - 14549 bytes in 0.361 second response time Source: noc01 Date: Sat Jul 24 12:18:11 UTC 2010