init.pp

class rsyslog {
  include logrotate::rsyslog

  package { 'rsyslog': 
    ensure => installed
  }
  
  service { 'rsyslog':
    ensure => running
  }

  $papertrail_port = $environment ? {
    'staging' => '1111',
    'master' => '2222',
    'skunkworks' => '3333',
    default => '4444'
  }

  file { '/etc/rsyslog.d/papertrail.conf':
    content => template('rsyslog/papertrail.conf.erb'),
    require => Package['rsyslog'],
    notify => Service['rsyslog']
  }
}

papertrail.conf.erb

*.*    @logs.papertrailapp.com:<%= scope.lookupvar("rsyslog::papertrail_port") %>