Argo CD GitOps

Designs and reviews Argo CD GitOps setups — App-of-apps and ApplicationSet patterns, sync waves, progressive rollouts with Argo Rollouts, drift detection, and secret management (Sealed Secrets / External Secrets / SOPS). Use whenever the user mentions "Argo CD", "ArgoCD", "GitOps", "App of apps", "ApplicationSet", "sync wave", "Argo Rollouts", "canary deploy via Argo", "blue/green via Argo", "Argo App is OutOfSync", "drift detection", "sealed secrets", or asks how to structure their Kubernetes deploy repos. Outputs concrete manifests, repo-layout guidance, and the specific patterns that hold up in production vs. the ones that collapse at scale.