Errors yesterday are on CMS side.

A couple of warnings on squid - 

1. many database queries from the site have connected directly to the Frontier servers or backup proxies, with a high rate of queries not going through the local squid(s): T1_UK_RAL\tcmscernct\t255759\t3922096
2. No IPv6 access

A small spike of job failures yesterday. Otherwise good performance.