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I haven’t found that option on the DigitalOcean Panel.
However in the API Docs both the endpoint to create a Cluster and to update a Node Pool include a field named labels defined as
object Nullable An object containing a set of Kubernetes labels. The keys and are values are both user-defined.
You could try to update your node pool using the CLI with the following command:
doctl kubernetes cluster node-pool update --label
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