Support sync waves for applicationset

[Emmerson-Miranda]

Summary

ApplicationSets generate argo applications, sometimes we have dependencies in the order to deploy the applications, for instance istio need cert-manager to be up and running first.

Motivation

Sometimes we have dependencies in the order to deploy the applications, for instance istio needs cert-manager to be up and running first. I another cases we depends in CRDs deployed by other apps.

I created a bug ticket and I was suggested to open an enhancement proposal here #17639

Proposal

We need to be able to generate argo applications with applicationset, inside each application we should be able to use the sync wave annotation.

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: cert-manager
  namespace: argocd
  metadata:
    annotations:
      argocd.argoproj.io/sync-wave: "-10"

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: istio
  namespace: argocd
  metadata:
    annotations:
      argocd.argoproj.io/sync-wave: "-9"

[ChristianCiach]

Isn't this what Progressive Syncs are for?

Also, there seems to be ongoing work for supporting explicit application dependencies:

• Application dependencies #7437

[Emmerson-Miranda]

Thanks @ChristianCiach

Is not what progressive syncs solves. I am not even reconsidering this because is Alpha.

Is the same case as Application dependencies you mentioned. I also fixed implementing app-of-apps but it should be nice if Argo applicationset can support waves to deploy dependent apps in certain order OOTB.