/usr/share/puppet/modules.available/puppetlabs-ntp/types/key_id.pp is in puppet-module-puppetlabs-ntp 7.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # See http://doc.ntp.org/4.2.6/authopt.html#controlkey for documentation
# Alternatively: type Ntp::Key_id = Variant[Integer, Pattern['']]
type Ntp::Key_id = Integer[1, 65534]
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