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The deploy queue usually gets to be a couple of "trains" deep which usually includes work from 4-10 devs. This represents a couple of hours. We have had issues with it taking too l…

a ton of internal debug logs :) We log all state machine transitions, poll the state machine to make sure it stays running, and do a ton of checks in the process. The debug button …

Yes there was. The change would have been quite a lot to do at once, and we aren't ready to safely add that circular dependency yet. We aren't done on this path, and this certainly…

It's actually longer than 5 minutes. There is the duration of the 2% canary deploy where we start to see pick up of traffic, a 5 minute wait, then a 20% "deploy", and a 5 minute wa…

It's mainly the simplicity of the deployment system as it's inline and visible, coupled with habit. It all actuality that is just what _can_ trigger the deploy, the actual deploy i…

We monitor Datadog dashboards, exceptions, and other metrics mainly, as well as smoke testing the application

This is correct :)

There is some GitHub used, but as others stated we don't want to create a circular dependency on ourselves in case we deploy something that is broken.

http://docs.shopify.com/pos/about-pos/hardware/supported-har... Here you go :)