Review of Zuul powered by the Slant community.
Zuul is an open-source CI tool implementing project gating at scale, across multiple projects like Gerrit, Gitlab, GitHub and Pagure.
SpecsUpdate
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Pros
Pro Speculative gating
Maximize gate throughput through the use of smart speculative testing pipelines.
Pro Cross-project gating
Allows to do CI across several interrelated projects and have changes in one depend on changes in others.