One of the chassis in the PHX1 datacenter was experiencing issues which took many services, including those on the generic web cluster offline and degraded others for approximately half an hour. Fixing the issue took approximately 15 minutes. Services should be back to normal.
For reference, the following web services were either downgraded, or unavailable:
generic cluster (contains many web apps)
plugins and plugins memcached
If you have any questions or concerns please address them to firstname.lastname@example.org.