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flagger/docs/gitbook/README.md
2020-02-28 18:20:57 +02:00

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description: Flagger is a progressive delivery Kubernetes operator
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# Introduction
[Flagger](https://github.com/weaveworks/flagger) is a **Kubernetes** operator that automates the promotion of
canary deployments using **Istio**, **Linkerd**, **App Mesh**, **NGINX**, **Contour** or **Gloo** routing for
traffic shifting and **Prometheus** metrics for canary analysis. The canary analysis can be extended with webhooks for
running system integration/acceptance tests, load tests, or any other custom validation.
Flagger implements a control loop that gradually shifts traffic to the canary while measuring key performance indicators
like HTTP requests success rate, requests average duration and pods health.
Based on analysis of the **KPIs** a canary is promoted or aborted, and the analysis result is published to **Slack** or **MS Teams**.
![Flagger overview diagram](https://raw.githubusercontent.com/weaveworks/flagger/master/docs/diagrams/flagger-canary-overview.png)
Flagger can be configured with Kubernetes custom resources and is compatible with any CI/CD solutions made for Kubernetes.
Since Flagger is declarative and reacts to Kubernetes events,
it can be used in **GitOps** pipelines together with Flux CD or JenkinsX.
This project is sponsored by [Weaveworks](https://www.weave.works/)