Maven / ArgoCD interview questions

What are the different application sync statuses in ArgoCD?

ArgoCD reports two orthogonal status dimensions for every application: Sync Status and Health Status. Understanding both is essential for diagnosing application state.

Sync Status

ArgoCD Sync Status Values
Status	Meaning
Synced	Live cluster state matches the desired state in Git exactly.
OutOfSync	One or more resources differ between Git and the cluster. Could be a new commit in Git not yet applied, or manual changes to the cluster (drift).
Unknown	ArgoCD cannot determine sync status, typically due to cluster connectivity issues or RBAC permissions preventing resource reads.

Health Status

ArgoCD Health Status Values
Status	Meaning
Healthy	All resources pass their health checks (Deployments at desired replicas, Services with endpoints, etc.).
Progressing	Resources are being updated and not yet stable (e.g., a Deployment rollout in progress).
Degraded	Resources have failed health checks (e.g., a pod in CrashLoopBackOff, or a Deployment with 0 available replicas).
Suspended	The resource is intentionally paused (e.g., a suspended CronJob).
Missing	The resource is defined in Git but does not exist in the cluster at all.
Unknown	ArgoCD does not have a health check rule for this resource type.

An application can be Synced but Degraded — meaning the Git state was applied correctly but the workload is unhealthy. These two axes must be evaluated independently.

An ArgoCD application shows Synced + Degraded. What does this mean?The Git state was applied successfully but the running workload is unhealthy

✓ Well done! Sync status and health status are independent; Synced only confirms the apply, not the workload health.

ArgoCD failed to apply the manifests from Git

✗ Try again — a failed apply would result in OutOfSync, not Synced.

The application has drifted from the Git-defined state

✗ Try again — drift would show as OutOfSync, not Synced.

Which health status does ArgoCD assign to a resource type it has no built-in health check for?Healthy — it assumes custom resources are always healthy

✗ Try again — ArgoCD does not assume health for unknown resource types.

Missing — it treats the resource as absent

✗ Try again — Missing applies when the resource exists in Git but not in the cluster.

Unknown — ArgoCD has no health check rule for that resource type

✓ Well done! Custom resources without a Lua health check script return Unknown health status.

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Maven / ArgoCD interview questions

What are the different application sync statuses in ArgoCD?

Sync Status

Health Status

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