/usr/share/doc/puppet-module-puppetlabs-apt/examples/key.pp is in puppet-module-puppetlabs-apt 4.5.1-1.
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 => '6F6B15509CF8E59E6E469F327F438280EF8D349F',
server => 'hkps.pool.sks-keyservers.net',
options => 'http-proxy="http://proxyuser:proxypass@example.org:3128"',
}
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