Resolved
The acute problem appears to be resolved based on observations over the past hour. We don't have a clear explanation for why the errors began and ended, so further investigation is needed.
Monitoring
The underlying errors that began at roughly 00:00 UTC subsided at roughly 01:00 UTC. We haven't found an explanation for the errors yet, so we are continuing to investigate and monitor the affected systems.
Investigating
Predictions made via the web interface are not available. We are actively investigating why.