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Some ingress annotations and command-line options can read resources from other namespaces. The watch-namespace command-line option just filter ingress resources from the informed namespace but all other resources are still read from the whole cluster. The force-namespace-isolation command-line option will enforce the read of just a single namespace, so the admin can configure a more strict permission to the controller's service account.
During lister refactor this behavior wasn't properly rewritten and watch namespace wasn't filtering ingress resources from a single namespace. This change fixes this behavior.