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Can hooks use sync waves to order among themselves? How do you notify an external system after a successful deployment using hooks? How do you seed initial data on first deployment only? How do hooks differ from plain resources with sync waves, and when do you choose each? How do you run post-deployment smoke tests and fail the sync if they fail? How do you coordinate hooks across multiple Applications (e.g., App of Apps)? What is a SyncFail hook and how is it used? How do you retry a failed hook Job? How do sync waves handle deletion order during pruning? How do you ensure a hook runs on every sync versus only on change?
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How do you order a multi-tier application deployment with waves?

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Answer

Assign ascending waves by dependency: namespaces/CRDs (wave -1/0), configuration and secrets (wave 0), stateful backends like databases (wave 1) with a readiness gate, then backend services (wave 2), then frontends (wave 3). ArgoCD waits for each wave to be Healthy, ensuring dependencies are ready before dependents deploy.
# db: sync-wave "1"; api: sync-wave "2"; web: sync-wave "3"
Real-world example The database (wave 1) must be Healthy before the API (wave 2), which must be up before the web tier (wave 3).

Common follow-ups: How does ArgoCD know a wave is done? | What if a wave never becomes Healthy?

Applications Sync & Health Sync Waves & Hooks
All 29 Sync Waves & Hooks questions