[sciurus]

Haproxy's full monitoring capabilities are available in the open source version. Nginx's are not. The stub_status module is very limited. Compare https://www.haproxy.com/blog/exploring-the-haproxy-stats-pag... with https://nginx.org/libxslt/en/docs/http/ngx_http_stub_status_...

[cyberpunk]

What exactly do you need to monitor on your nginxes? We collect logs, scrape metrics from the nginx pods and... that's enough..