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> Unfortunately this deployment went to a system that we believed was not a critical part of infrastructure

Deploying to a different, lower priority system is not a canary. Do you phase deployments to each system, per host or zone?

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For critical systems (or let's call them services) such as DNS, CDN, optimizer, storage, we usually deploy either on a server to server basis, regional basis or cluster basis before going live. What I mean here was that this was not really a critical service that nobody thought could actually cause any harm, so we didn't do canary testing there as it would add a very high level of complexity.

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