Puppet users - Sep 2014 - Cross-module variables and mix-and-match with Hiera

Hello,

I'm using puppet 3 with roles (mostly), profiles, and Hiera. I have a 
profile setup (for pdxcat/collectd) to, amongst other things, hiera_array() 
for values [of localports] to pass on to collectd::plugin::tcpconns. 
Defining everything in hiera files works as expected. However, I would like 
to add to those values from other profiles. But I haven't been able to get 
that working. Any suggestions?

If the below text isn't displaying properly I've also created a 
gist: https://gist.github.com/kimor79/b0cdd99cb98c01892049

Thanks
Kimo

hiera.yaml (condensed):
  ---
  :hierarchy:
    - roles/%{role}
    - common

hiera/roles/app-db.yaml:
  ---
  classes:
    - profiles::postgresql::server

  # This works as expected:
  # profiles::collectd::tcpconns_localports:
  #    - 5432

hiera/common.yaml:
  ---
  classes:
    - profiles::collectd

  profiles::collectd::tcpconns_localports:
    - 22

profiles/manifests/collectd.pp:
  class profiles::collectd {

    # This is an array lookup so multiple hiera files can add ports to 
watch.
    $tcpconns_localports  = 
hiera_array('profiles::collectd::tcpconns_localports')
    $tcpconns_remoteports = 
hiera_array('profiles::collectd::tcpconns_remoteports')

    # NOTE: If you need to pass "false" onto the collectd config make
sure
to
    # quote the false (foo => 'false') as some templates only do a
simple if
    # statement (if @foo) which when foo is undef evaluates to false.

    class { '::collectd':
      purge        => true,
      purge_config => true,
      recurse      => true,
    }
  
    class { '::collectd::plugin::tcpconns':
      listening     => 'false',
      localports   => $tcpconns_localports,
      remoteports => $tcpconns_remoteports,
    }
  }

profiles/manifests/postgresql/server.pp:
  class profiles::postgresql::server {
    class { '::postgresql::server': }
  
    # I would like to be able to add this here so I don't have to remember 
to
    # add it to every %{::role}.yaml which includes this class.
    # $::profiles::collectd::tcpconns_localports += [ '5432' ]
  }

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