/usr/share/doc/puppet-module-puppetlabs-apt/examples/key.pp is in puppet-module-puppetlabs-apt 2.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # Declare Apt key for apt.puppetlabs.com source
apt::key { 'puppetlabs':
id => '47B320EB4C7C375AA9DAE1A01054B7A24BD6EC30',
server => 'pgp.mit.edu',
options => 'http-proxy="http://proxyuser:proxypass@example.org:3128"',
}
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