The `letsencrypt-email-prod` and `letsencrypt-email-stag` properties can now be set per app in addition to globally, resolving app-level before the global value for the app's selected `letsencrypt-server`. An app that sets its own email renders a namespaced cert-manager `Issuer` using that email, while apps without an override continue to use the shared `ClusterIssuer` with the global email.
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