Seems to be testing from just one location, as far as I can tell?
Randomly, packets time out on the internet, I would take this random dashboard with a grain of salt, we cannot be sure SO had a outage just because one request happen to fail.
With a caveat that pingdom will mark "a connection from pingdom server from other side of the world to the server" as downtime, even if the target and your ISP, and the ISP of your ISP had no problems.
Randomly, packets time out on the internet, I would take this random dashboard with a grain of salt, we cannot be sure SO had a outage just because one request happen to fail.