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This content is part of the Essential Guide: ALM best practices for advanced DevOps organizations
Definition

canary (canary test, canary deployment)

In software testing, a canary is a push of programming code changes to a small group of end users who are unaware that they are receiving new code. Because the canary is only distributed to a small number of users, its impact is relatively small and changes can be reversed quickly should the new code prove to be buggy. Canary tests, which are often automated, are run after testing in a sandbox environment has been completed.

For incremental code changes, a canary approach to delivering functionality allows the development team to quickly evaluate whether or not the code release provides the desired outcome. The word canary was selected to describe the code push to a subset of users because canaries were once used in coal mining to alert miners when toxic gases reached dangerous levels. Like the canary in a coal mind, the end user who is selected to receive new code in a canary test is unaware he is being used to provide an early warning.

In canary testing, a small subset of traffic serves as a test for updates. If anything in the update causes problems, it alerts the IT team before a large group of users feel the effects. In canary testing, a small subset of end users serves as a test group for updates. If anything in the update causes problems, it alerts the IT team before a large group of users feel the effects.

This was last updated in November 2016

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I think there might be a typo here.
Users "not volunteering" seems like a seriously dubious business practice.
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There's a bit of confusion here.
Users' reaction and experience might be tested with this "canary code" but those users do not perform any testing.

Testing includes investigation, isolation, and reporting of the problem. "It sucks" is not very actionable report but one can't hope to get any better with this so called "canary testing".
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Does Amazon Web Services allow canary release?
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