Integrated Web Application Firewall (WAF) and/or DDOS protection

### Required Terms

- [X] I agree to follow this project's [Code of Conduct](https://github.com/heroku/roadmap/blob/main/CODE_OF_CONDUCT.md)
- [X] I have read and accept the [Salesforce Program Agreement](https://www.salesforce.com/company/program-agreement/)

### What service(s) is this request for?

Runtime, Routing

### Tell us about what you're trying to solve. What challenges are you facing?

Currently Heroku customers have to choose and configure add-ons and/or 3rd party services to protect apps running on Heroku from assorted attacks. We have many customers asking us to integrate this into the product for easy-of-use and ease-of-setup.