argo-cd/docs/user-guide/sync-options.md

Sync Options

No Prune Resources

v1.1

You may wish to prevent an object from being pruned:

metadata:
  annotations:
    argocd.argoproj.io/sync-options: Prune=false

In the UI, the pod will simply appear as out-of-sync:

The sync-status panel shows that pruning was skipped, and why:

The app will be out of sync if Argo CD expects a resource to be pruned. You may wish to use this along with compare options.

Disable Kubectl Validation

v1.2

For a certain class of objects, it is necessary to kubectl apply them using the --validate=false flag. Examples of this are kubernetes types which uses RawExtension, such as ServiceCatalog. You can do using this annotations:

metadata:
  annotations:
    argocd.argoproj.io/sync-options: Validate=false

If you want to exclude a whole class of objects globally, consider setting resource.customizations in system level configuation.