[http://docs.puppetlabs.com/guides/language_tutorial.html#run_stages Run stages] were introduced in Puppet v2.6. Within Sugar Labs infrastructure there are additional, to default Puppet, stages. All puppet modules should take care about it.
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Defined tages:
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* ''initialize'' only for high-level initialization on nodes level,
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* ''main'' default Puppet stage to run nodes.
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Modules resources should be registered after ''initialize'' stage and might be before ''main'' one.