Unconfirmed, but it seems to align with the train deployment, not T181006.
<https://grafana.wikimedia.org/dashboard/file/varnish-http-errors.json>
{F10907168 height=200}
### Server Admin Log
> 22:04 <demon@tin> rebuilt wikiversions.php and synchronized wikiversions files: group2 to wmf.8
> 22:27 <awight@tin> Finished deploy [ores/deploy@5084251]: Updating ORES to revscoring 2.0.10, `T179711` (duration: 49m 54s)
> 22:49 <Krinkle> Sharp rise in HTTP 500 errors as of 22:05 (45 minutes ago)
> 22:54 <awight@tin> Started deploy [ores/deploy@5084251]: Rollback ORES; T179711
> 22:55 <awight> rolling back ORES to fix T181006
> 22:55 <demon@tin> rebuilt wikiversions.php and synchronized wikiversions files: no wmf.8 for group2. i hate my life
> 22:55 <awight@tin> Finished deploy [ores/deploy@5084251]: Rollback ORES; T179711 (duration: 01m 05s)
>