Do blog post on how we scale to 500 req/s

[ericholscher]

We got a bunch of love for this post: https://www.ethicalads.io/blog/2021/07/handling-100-requests-per-second-with-python-django/ -- we should do one for RTD. It can:

• Talk about our architecture (Scaling Groups, Postgres, CDN, S3)
• Highlight sponsors (AWS, Cloudflare)
• Talk about some performance issues we've hit (404 tracking, 404's in general :x)

[davidfischer]

Just to add, I think adding a little detail around what we're doing with sendfile and proxy headers is interesting as well.

[davidfischer]

Also, I remember the weekend where we suffered an ongoing denial of service attack that spurred some of this action. It was the first weekend of August 2019. We were getting hundreds of thousands of new user accounts per day!