Scaling ArgoCD to 3000+ Applications: HA and Multi-Cluster Sharding

Tue, 13 Jan 2026 22:10:00 +0100

As organizations grow, so does their GitOps footprint. Managing a couple dozen applications with ArgoCD is a walk in the park — you install it, point it at your repo, and everything just works. It’s beautiful. You start bragging about GitOps on Reddit. Life is good.

Then you hit 3,000+ applications across dozens of Kubernetes clusters.

Suddenly, reconciliation loops take forever. The UI feels like it’s running on a potato. The application-controller starts getting OOM-killed at 3 AM, and your on-call engineer is questioning their career choices. Your Slack channel fills up with “is ArgoCD down again?” messages, and you start wondering if maybe spreadsheets were fine all along.

GCP on jakubszostak

Scaling ArgoCD to 3000+ Applications: HA and Multi-Cluster Sharding