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| description |
|---|
| Flagger is an Istio progressive delivery Kubernetes operator |
Introduction
Flagger is a Kubernetes operator that automates the promotion of canary deployments using Istio routing for traffic shifting and Prometheus metrics for canary analysis.
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 the KPIs analysis a canary is promoted or aborted and the analysis result is published to Slack.
Flagger takes a Kubernetes deployment and creates a series of objects Kubernetes [deployments](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/), ClusterIP [services](https://kubernetes.io/docs/concepts/services-networking/service/) and Istio [virtual services](https://istio.io/docs/reference/config/istio.networking.v1alpha3/#VirtualService) to drive the canary analysis and promotion.