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It's just a way to easily filter the kind (type) of k8s resource to transform; e.g.:

new ConfigFile($"{prefix}-ingress",
    new ConfigFileArgs
    {
        File = "ingress-controller.yml",
        Transformations =
        {
            (obj, opts) => obj.Mutate("Deployment", deployment =>
            {
                var args = (List<object>)deployment.spec.template.spec.containers[0].args;
                args.AddRange(new[] { $"--aws-region={config.AwsRegion}", $"--cluster-name={name}" });
            })
        }
    },
    new ComponentResourceOptions { Provider = Provider });

To transform the k8s deployment resource

Got it, thanks. Yeah, I agree, your extensions help with that though. 🙂

I recommend using kube2pulumi instead, which gives much more control, but might not be practicable for large yaml files while tracking upstream changes, depending on how much you tweak the resulting c# to your liking. 😉