<p>In official document, the default replicas of argo-server and workflow-controller is set to 1. Should it be set to 3 in the production environment for high availability?</p>

<p><a href="https://github.com/argoproj/argo/blob/master/docs/scaling.md" rel="nofollow noreferrer">According to Argo's scaling documentation</a>, the Argo Workflows controller cannot be horizontally scaled. In other words, you should only have one replica.</p>
<p>You can have multiple Argo installations (called &quot;instances&quot; in their documentation) if you're okay splitting your work up that way. You can also vertically scale the single controller replica to better handle large workflows or high numbers of workflows.</p>
<p>UPDATE: the latest version of argo-workflows supports multiple replicas for the controller with leader election which improves availability (reference: <a href="https://blog.argoproj.io/argo-workflows-v3-0-4d0b69f15a6e" rel="nofollow noreferrer">https://blog.argoproj.io/argo-workflows-v3-0-4d0b69f15a6e</a>)</p>
