def get_one(self, instance_id):
        """
        List triggerinstance by instance_id.

        Handle:
            GET /triggerinstances/1
        """
        return self._get_one_by_id(
            instance_id, permission_type=None, requester_user=None
        )

        List triggerinstance by instance_id.

        Handle:
            GET /triggerinstances/1
        
st2api/st2api/controllers/v1/triggers.py