ArgoCD App Webhook

Overview

The ArgoCD App Webhook is a Kubernetes admission webhook designed to optimize the handling of ArgoCD Application resources by filtering out unnecessary updates. Specifically, it prevents updates that only modify status.reconciledAt, reducing API server load and ETCD database growth.

Benefits

1. Reduces API Server Load: Prevents frequent PATCH API calls caused by status.reconciledAt updates.
2. Optimizes ETCD Storage: Minimizes unnecessary revision history storage in ETCD.

Deployment

./cert.sh

kubectl apply -f webhook-deployment.yaml
kubectl apply -f webhook-validatingwebhookconfiguration.yaml

kubectl -n argocd patch validatingwebhookconfiguration application-admission-webhook \
  --type='json' \
  -p="[{
    \"op\": \"replace\",
    \"path\": \"/webhooks/0/clientConfig/caBundle\",
    \"value\": \"$(cat certs/ca.crt | base64 | tr -d '\n')\"
  }]"