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i think you will need to adopt your pre-existing "default" namespace into pulumi first `<https://www.pulumi.com/docs/guides/adopting/import/>` then once that resource exists in your pulumi stack you will be able to modify it

ah, so an `import` like Terraform, makes sense

im presuming you dont create your cluster with pulumi initially ?

something like this python pseudocode :
```default_namespace = k8s.core.v1.Namespace("default", opts=pulumi.ResourceOptions(provider=k8s_provider), metadata=k8s.meta.v1.ObjectMetaArgs(name="default"),import_='default')```

or you can just do the same via cli then on your pulumi up you can add your metadata . . . depends on your orchestration needs