Basic example of scaling netflow collectors behind NGINX load balancer and being able to configure policies based on certain thresholds for ICMP/TCP/UDP traffic and automatically mitigate potential DDoS attacks using nfacctd and exabgp + BGP Flowspec.
The blog can be found at bspendlove.github.io called Auto DDoS mitigation using BGP Flowspec and Netflow. This repository holds all the data as per the blog, if you are to use this in production (which I don't advise) then please ensure you change all credentials in the relevant .env files under the envs directory. These are lab credentials and are certainly not considered secure.