This really is a fantastic rundown of Azure websites and scaling on Azure.

As always Troy has put loads of effort into writing a really high quality blog post that shares some really useful information for devs working on this stack (and for non .Net devs too).

This is a great writeup, and it shows that Azure provides fantastic UX. I'm also grateful that you include the price. If HIBP ran on < $50, I can surely launch a product and shell out $5/month, if only for bragging rights. You've sold me on trying this out

scaling? databases?

this is serving up some static content, and a string lookup in a hash table.

a single cheap vps with 768mb of ram should be able to handle thousands of requests/second without issue.

(50 chars email average + 2 * 4 byte pointers) * 10M entries => 512mb ram

(and with some noddy splitting by email domain you could probably quarter that)

Good write up, I also would add two alerts from diffferent locations with server response time > 5 seconds ive or take depending on your site speed.