Between 23:16 - 23:22 UTC December 14th, 2018 some jobs failed with Application error due to spikes in infrastructure load.
We are investigating the root cause and taking measures so that this does not repeat.
We deeply apologize for the inconvenience caused.
Update [Dec 15, 2018, 08:19 CET]: This still happens occasionally.
Update [Dec 15, 2018, 10:57 CET]: We're still working on mitigating the issue. Comparing to historical hourly avg, actual job error rate is 6% bigger.
Update [Dec 15, 2018, 11:47 CET]: We're going to deploy patch into production. It will take about 2 hours. Expected resolution: 14:00 CET
Update [Dec 15, 2018, 12:45 CET]: Patch has been deployed.