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Pulumi does not properly recognize that the `spec.controller` field of an `IngressClass` is immutable so the resource needs to be recreated. Not sure by which mechanism Pulumi does that, but should I create a ticket for this?

it's handled here, yes a ticket would be great!
<https://github.com/pulumi/pulumi-kubernetes/blob/master/provider/pkg/provider/diff.go>

I can probably get this added fairly quickly if you cut an issue

<https://github.com/pulumi/pulumi/issues/8100>
Thanks Lee!