ArgoCD OutOfSync when using Gateway API

[adambkaplan]

Describe the bug

When managing ArgoCD with ArgoCD (Application referencing the helm chart), the Application remains OutOfSync due to the defaulting behavior of the Gateway APIs.

Root cause is a diff in the backend refs - missing the following:

  backendRefs:
    - group: ''
      kind: Service

Workaround: add the following ignoreDifferences to the Application yaml:

  ignoreDifferences:
    - group: gateway.networking.k8s.io
      kind: HTTPRoute
      jsonPointers:
        - /spec/rules/0/backendRefs/0/group
        - /spec/rules/0/backendRefs/0/kind

Related helm chart

argo-cd

Helm chart version

8.6.3

To Reproduce

1. Install ArgoCD on the cluster using the Helm chart.

   helm install argo-cd oci://ghcr.io/argoproj/argo-helm/argo-cd \
    	--version 8.6.3 \
    	--namespace argo-cd \
    	--create-namespace

2. Install the Gateway APIs (can be done with an ArgoCD Application!)

   apiVersion: argoproj.io/v1alpha1
   kind: Application
   metadata:
     finalizers:
       - resources-finalizer.argocd.argoproj.io
     name: gateway-api
     namespace: argo-cd
   spec:
     destination:
      server: https://kubernetes.default.svc
      project: default
    source:
      path: config/crd
      repoURL: https://github.com/kubernetes-sigs/gateway-api
      targetRevision: v1.4.0
    syncPolicy:
      automated:
        prune: true
        selfHeal: true
      syncOptions:
        - CreateNamespace=true
        - PrunePropagationPolicy=foreground
        - PruneLast=true
        - ServerSideApply=true

3. Add an Application that takes over the management of ArgoCD's deployment:

   apiVersion: argoproj.io/v1alpha1
   kind: Application
   metadata:
     finalizers:
       - resources-finalizer.argocd.argoproj.io
     name: argo-cd
     namespace: argo-cd
   spec:
     destination:
       namespace: argo-cd
       server: https://kubernetes.default.svc
     project: default
     source:
       helm:
         valuesObject:
           configs:
             params:
               server.insecure: true
           global:
             domain: argo-cd.k8s.local
           server:
             httproute:
               enabled: true
               hostnames:
                 - argo-cd.k8s.local
               parentRefs:
                 # Note: this is a gateway I created for the above domain
                 - group: gateway.networking.k8s.io
                   kind: Gateway
                   name: central-gateway
                   namespace: central-gateway
                   sectionName: https-wildcard
       path: .
       repoURL: oci://ghcr.io/argoproj/argo-helm/argo-cd
       targetRevision: 8.6.3
     syncPolicy:
       automated:
         prune: true
         selfHeal: true
       syncOptions:
       - CreateNamespace=true
       - PrunePropagationPolicy=foreground
       - PruneLast=true
       - ServerSideApply=true
   

Expected behavior

ArgoCD deploys the helm chart and is able to successfully sync.

Screenshots

Additional context

No response