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I think this answer is yes based on my reading of these links https://www.puppet.com/docs/puppet/7/nodes_external.html#comparing_encs_and_node_definitions https://www.puppet.com/docs/puppet/7/lang_scope.html#lang_scope-scope-of-external-node-classifier-data This assumes that top-scaope vars can be used for Hiera keys. I'm pretty sure I've used top-scope vars this way, but can't find a reference in docs.

I'm on a mix of 6 and 7. I think I'll test this and find out.

I wouldn't expect any difference between 6 and 7. PE is definitely doing this via the console for node groups, etc.

Yes, they're definitely available to Hiera. I've done this for years since Puppet 4.

Thanks