Both of these Google outages made it to the HN frontpage:

https://news.ycombinator.com/item?id=20077421

https://news.ycombinator.com/item?id=20338263

Both of these AWS outages made it to the HN frontpage (and neither are listed in that AWS timeline):

https://news.ycombinator.com/item?id=20298719

https://news.ycombinator.com/item?id=19749781