See earlier discussion of the outage itself:

https://news.ycombinator.com/item?id=32026637

And Cloudflare's view of the impact: https://blog.cloudflare.com/cloudflares-view-of-the-rogers-c... (https://news.ycombinator.com/item?id=32029360)

There's a Wikipedia article which will hopefully include details and links on cause / post mortem:

https://en.wikipedia.org/wiki/July_2022_Rogers_Communication...