After enabling "Publisher Actions" for Chatter, you can tick a checkbox called "All Related Objects" for a specific object in Setup > Customize > Chatter > Feed Tracking. This will turn on the functionality where a Chatter post is created on the object whenever any child object is created.
However, I can't find where this "All Related Objects" field is stored in metadata? I don't see it in the metadata for a custom object, which is where I would expect it to be.
Is this field available somewhere else in metadata? If so, is it packageable?