If you've used Puppet for anything non-trivial, you've almost certainly used it to configure something secret. Perhaps you've configured an application with a database password. Perhaps you've configured a local maintenance user account with a private SSH key. Something that might seem obvious in retrospect is that these secrets exist in the catalog--and by extension all reports and any other tooling that uses them. Anyone with access to the catalog or raw reports also has access to your secrets. All your secrets.