Lessons from a Large-Scale GitOps Implementation
summary
A large bank implemented a yearlong GitOps rollout using Argo CD and found Argo CD hit scale limits quickly, so they built a custom provisioning layer and per-cluster admin tooling to manage thousands of apps across multiple clusters. They emphasized monitoring Argo success rates and internal metrics, strict validation and review to catch typos and broken YAML, a phased rollout (start with a few apps and grow), and that the main challenge was human adoption and ongoing education rather than the tooling itself.
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