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If you are using a package resource and

ensure

was set as

present

or

installed

it would only ensure it was there and not upgrade even if the repos changed but more specifically you should be able to use this fine with

apt::mark {'locales'':
  setting => 'hold',
}

If you don't mind could you raise a ticket at https://github.com/puppetlabs/puppetlabs-apt/issues to highlight lack of example and documentation there

Thanks! I finally chose this simple statement:

package {'locales':  mark => "hold",}