This seems to come up for me a lot.  As an example, my Hiera data
includes both hypervisors and the VMs that they contain.  It would
be very useful to have the VMs say "I'm a VM on host X" and, in
templates in host X, be able to say "What are all my VMs?".

Doing this via storeconfigs rather defeats the purpose of my Hiera
tree, which is to be the single source of truth.

The way I'm currently doing it is to have a script that collates all
my Hiera host data into a special YAML file, and then have templates
read that YAML.

I'm wondering if there's a better/more correct/more idiomatic way to
engage in this sort of referential linking across the Hiera tree?

-Robin

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