def remove_flow_controller(cls, name):
        """
        Removes a flow controller.
        Args:
            name (string): Name of the controller to remove.
        Raises:
            KeyError: If the controller to remove was not registered.
        """
        if name not in cls.registered_controllers:
            raise KeyError("Flow controller not found: %s" % name)
        del cls.registered_controllers[name]
Removes a flow controller.
        Args:
            name (string): Name of the controller to remove.
        Raises:
            KeyError: If the controller to remove was not registered.