A maintenance window was scheduled to upgrade core libraries, requiring a brief period of web unavailability, initially estimated at 30 seconds, but ultimately lasting one minute and 40 seconds. During this time, all daemons were restarted simultaneously, with some job runners failing to restart cleanly, leading to job failures, although normal operations resumed shortly thereafter. Users experiencing issues were encouraged to contact support for assistance. The successful completion of this maintenance was communicated by Tom Preston-Werner.