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How do you view aggregated application status across clusters? Can you run ArgoCD per cluster instead of a central hub, and why? How do you deploy the same application to many clusters efficiently? How do you handle per-cluster configuration differences? How does ArgoCD scale to hundreds of clusters and applications? How do you handle credentials rotation for many clusters? How do you achieve high availability for the ArgoCD control plane? How do you isolate tenants across clusters? How does controller sharding distribute cluster load? What are security considerations for a hub managing many clusters?
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What are the failure and resilience considerations for multi-cluster ArgoCD?

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Answer

In hub-and-spoke, hub outage stops deployments to all spokes (though running workloads keep running), and the hub needs reliable network to every API. Mitigations: HA ArgoCD, backups of app definitions in Git (rebuildable), regional/independent instances for critical isolation, and monitoring connectivity to each cluster.
Real-world example The hub ArgoCD is run HA and its config lives in Git, so a hub failure is recoverable and doesn't affect already-running workloads.

Common follow-ups: Does a hub outage stop running workloads? | How do you make the hub resilient?

App of Apps RBAC Multi-cluster
All 29 Multi-cluster questions