[arihant]

I think after reading the article, it is pretty clear they did not notice the routing issues until they noticed slowed down performance and till their consumers complained. That makes perfect sense, you don't really dig deep into routing until you hit a bottleneck, specially when you are unable to monitor it, and specially when your provider is lying to you about how they route.

[iends]

Several people have posted support logs that Heroku knew about the issue long before.