Ask HN: How to get ISP outage data?

[ternaryJimbo]

Hi, I'm working on an open source project where I'd like to incorporate ISP outage data.

This service claims that it reports accurate ISP outage data, that is not crowdsourced like downdetector: https://www.thousandeyes.com/outages/faq

Quote: "Q: Where does outage data come from?

A: ThousandEyes agents located across the Internet perform billions of measurements each day, yielding a massive data set that includes network interface and application server-level information on when and where network traffic is disrupted and applications are unavailable."

Anyone wager a guess on what websites they are scraping, and what measurements they are making to come up with this data?