This is part of the The Road to Making Puppet Optional work. You can certainly still use them, but in the future they (along with puppet classes, environments and class parameters) will require the foreman_puppet plugin.
As described in Puppet in 3.0 release, initially the plugin will be installed by default, allowing a smooth upgrade path for puppet users. Users who do not wish to continue using the plugin will be provided with instructions on how to remove it and clean up the database.
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