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How do you handle CRDs and their custom resources syncing in the right order? How can you customize health checks for third-party or custom resources? How do you implement progressive delivery (canary/blue-green) with ArgoCD? How do you prevent auto-sync from applying an unwanted change during an incident? How do you debug why an app never reaches Healthy after a successful sync? How do sync windows control when syncs are allowed? How do you integrate Argo Rollouts analysis into sync health?
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How do you monitor ArgoCD itself (metrics and observability)?

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Answer

ArgoCD exposes Prometheus metrics from its controllers (app sync counts, reconciliation performance, health status, repo-server and API server metrics). You scrape them, build Grafana dashboards, and alert on sync failures, reconciliation latency, or OutOfSync counts. Logs and the app events/audit provide deeper diagnostics.
# ServiceMonitor scraping argocd-metrics, repo-server, api-server
# Alert on: argocd_app_info{sync_status="OutOfSync"} and sync failures
Real-world example A Grafana dashboard tracks sync success rate and reconciliation latency, alerting when OutOfSync apps spike.

Common follow-ups: Which components expose metrics? | What would you alert on?

Applications Multi-cluster Sync & Health
All 29 Sync & Health questions