Wondering what happened at Cloudflare? Here is their postmortem, this is an interesting read.
Now for Rust developers... this is a good illustration of why you should stay clear from unwrap() in production code.

Kind of ignore the security impact of the needed upgrades, but apart from this I largely agree. Most applications try to push more features in your face nowadays, unneeded notifications and all... this is frankly exhausting the users.

This is a nice little algorithm and it shows how to approach it in Python while keeping it efficient in term of operations.