Why is AttributeK8SClusterName missing from k8sattributes?

[joedborg]

Any reason why AttributeK8SClusterName (k8s.cluster.name) was removed from

opentelemetry-collector-contrib/processor/k8sattributesprocessor/options.go

Line 121 in d30a938

func withExtractMetadata(fields ...string) option {

?

I'm trying to upgrade to 0.81 from 0.30 and and having errors because of this missing. If I remove it, I don't seem to get any logs in Splunk anymore.