alternative to fail2ban as complement to nginx

Hello guys, Iam using several mechanisms to rate limit abusers...but I would like to ban those that do it repeatedly. Anybody use anything better than fail2ban ? Iam worried that it will hog down the server if it gets a big amount of logs. Alex ___ ng

limit_conn_zone applied to Proxy_Pass (outgoing requests)

Hello! I have an nginx reverse proxy it has a series of filters against DDoS attacks. As a last resort I need to make sure that I NEVER send more than x concurrent requests to the backend server (Proxy_pass) Is it possible to apply limit_conn_zone for outgoing requests? If so could i have an exa