Args:
stage (`str`):
Current stage of the space. Example: RUNNING.
hardware (`str` or `None`):
Current hardware of the space. Example: "cpu-basic". Can be `None` if Space
is `BUILDING` for the first time.
requested_hardware (`str` or `None`):
Requested hardware. Can be different than `hardware` especially if the request
has just been made. Example: "t4-medium". Can be `None` if no hardware has
been requested yet.
sleep_time (`int` or `None`):