Not that I've heard of such a tool, but if you archived catalogs somewhere you 
could compare the lists of resources over time. Or you could turn on catalog 
hash debugging to grab the current/previous catalog for the same technique:

http://docs.puppetlabs.com/puppetdb/latest/trouble_low_catalog_duplication

Not that I've ever tried this, I should point out.

On Thu, May 29, 2014 at 09:58:59AM -0400, Martin Langhoff wrote:
>    As the complexity of our $workplace puppet configuration grows, I am
>    increasingly worried that puppet gives us very limited visibility over
>    resources it no longer manages.
> 
>    In practical terms: if I mess up my class include/require/inherit
>    structure so that a node A no longer indirectly includes module Foo,
>    resources managed by Foo are present in A but "orphaned".
> 
>    This is a lurking gotcha; and it can lead to subtle problems.
> 
>    Is there any tool that helps here, for example keeping a manifest of all
>    resources ever managed by this puppet install? If not, I will probably try
>    build that into ppg.
> 
>    Is there a way to ask puppet for a fuller, more explicit report of all
>    resources tracked during a run?
> 
>    Thanks,
> 
>    m
> 
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