A streamer could 'freeze' its own channel. This means their sub will receive a notification (generic message) that they will not be streaming for an indefinite amount of time.
It will also 'freeze' the subscriptions of viewers so that they don't get charged during this period of streaming inactivity. The subscriptions would resume upon the streamer 'unfreezing' its channel, with the subscribers getting another notification (generic message).
The polite and efficient thing to do for streamers, viewers and Twitch.