What happens when an RSS feed is broken?
Our systems try to fetch the latest feed data from corresponding servers regularly. When a server gives an error we keep trying it 2 more times until we suspend the feed for 6 hours.
After 6 hours, our systems re-check the feed if it is working or not. If it works, we keep pulling data from it, and send posts based on the feed rules. If it fails again, we suspend the feed for another 6 hours before giving it a try.