Resolved - After some configuration fixes, all mirrors are correctly syncing. (12:30 — Mar 11)
Update - After more investigation, it seems some mirrors are out of date, and not syncing correctly. (10:25 — Mar 11)
Resolved - After updating IP address entries on the new mirrors server, traffic seems to have stabilized. (02:36 — Mar 11)
Investigating - After transferring our mirrors service to a new server, connections from certain networks outside Berkeley seem to be blocked. (01:20 — Mar 11)