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Use the core facts https://www.puppet.com/docs/puppet/7/core_facts.html#os

operatingsystem

is a legacy fact and those are disabled by default in puppet 8

Thank you, is it possible to declare a new variable like

operatingsystem = $facts['os']['name']

or should i change all operatingsystem variables to $facts['os']['name'] in all pp files?

Change to using the newer fact, rather than the disabled legacy fact. And it does't make sure to setup a new variable that is just an existing fact.