level, with each lower level overriding the setting of the higher parent level. For example, if the global default
namespace is defined as:

```yaml
defaultNamespace: istio-system
```

and namespaces are specialized for the gateway feature and its components:

```yaml
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  namespace: istio-operator
spec: