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Create canary deploy process for MediaWiki
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Tracking task for creating a canary deploy process in response to next steps identified in https://wikitech.wikimedia.org/wiki/Incident_documentation/20160601-MediaWiki

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thcipriani claimed this task.

For MediaWiki we are currently running a basic swagger check to check responses for a small number of endpoints, and a logstash check to monitor drastic changes in the error rate for logs during for each deployment. Scap3 deployments provide a mechanism for repository maintainers to write and run their own checks as well as respond to nrpe checks.

I think we have the basics of a canary process for both MediaWiki and scap3 deploys of other repositories and services. Calling this resolved.