Related comments on reddit:
* https://www.reddit.com/r/Heroku/comments/1r7o1hk/outage/ * https://www.reddit.com/r/youtube/comments/1r7onh1/youtube_we...
The correlation with scheduled restarts is interesting though. Makes me wonder if there's a cert validation issue on boot that's causing new instances to fail health checks.
Unusual to see all three blowing up at the same time.
If you're serious about migrating off (and not just saying it in the heat of the moment), the main thing is having a plan for the database migration. That's always the painful part. Everything else is just Docker containers that run anywhere.