@mastohost, let us know if we can help with something. I'm honestly looking to get away from the five-nines mentality demanded by "ad-tech" companies. Scheduled down time sounds like a good option to me.
I was thinking of searching for a standard/proposal that uses to DNS records (or DHT) to publish a schedule and a way to throttle requests by kindly asking servers to be good netizens, but that's a lot of work I don't want to do.