I would like to be able to patch an existing resource using Argo CD. OpenShift freshly installed, out of the box, comes with a lot of resources/objects already there. This has been brought up before.

Example: Patching an existing deployment

apiVersion: apps/v1
kind: Deployment
metadata: 
  name: mydeploy
  annotations: 
    argocd.argoproj.io/apply-type: patch
spec: 
  replicas: 3

In this case, I don't have to provide the whole manifest. Just what I want to patch. The annotation is to flag argo to perform a "patch" on this resource instead of an apply. Effectively doing:

kubectl patch <resource>/<name> --patch $(cat patch.yaml)

If the resource doesn't exist, it should fall back to using "apply", or fail outright.