If you've got PuppetDB set up already then this is fairly simple. We use
the puppetdbquery module (https://github.com/dalen/puppet-puppetdbquery) to
do something like
$collectors = query_nodes('Package[A]', 'fqdn')
Which would return an array of the FQDNs of all nodes that declared package
a - the second argument can be any fact name. The query string can also be
as complex as you like, matching resources with certain attributes or fact
values. We use it to manage ElasticSearch clusters of which we have
multiple, so we use a tag containing the cluster name to narrow down
queries.
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