Are Deployments only for stateless applications?

Generally, yes. Deployments assume that any pod can be killed or cloned at any time. For stateful applications (like a primary-replica Database cluster where identity and startup order matter), you must use a different controller called a `StatefulSet`.

Can I pause a Rolling Update in the middle?

Yes! You can run `kubectl rollout pause deployment/ `. This is useful for 'Canary' deployments, where you want exactly one new pod to run for an hour to observe error rates before allowing the rest to update.

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