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Re:Command execution on Ansible controller from host by bcoca on Thursday January 12, 2017 @08:59PM (#13387844)
it is not a host definable fact, it is a 'host variable' which you normally define in inventory.
Re:Command execution on Ansible controller from host by ensignavenger on Friday January 13, 2017 @01:06PM (#13392970)
From the advisory:

When Ansible runs on a host, a JSON object with Facts is returned to the Controller. The Controller uses these facts for various housekeeping purposes. Some facts have special meaning, like the fact "ansible_python_interpreter" and "ansible_connection".

So while you may normally define it in the inventory, it sounds like, from the advisory, it can also be defined by the host.