'Prometheus: find max RPS

Say I have two metrics in Prometheus, both counters:

Ok:

nginx_ingress_controller_requests{prometheus_from="$cluster", ingress="brand-safety-phoenix-service", status="200"}

Failure:

nginx_ingress_controller_requests{prometheus_from="$cluster", ingress="brand-safety-phoenix-service", status!="200"}

Total:

nginx_ingress_controller_requests{prometheus_from="$cluster", ingress="brand-safety-phoenix-service"}

My question is how to find on which RPS failures occurred as promQL query

I'm expecting the following response:

400

Means, that if pod receives > 400 RPS, Failure metric begin to happen

full query (after got answered) enter image description here

sum((sum(rate(nginx_ingress_controller_requests{prometheus_from="$cluster", ingress="brand-safety-phoenix-service"}[$__rate_interval])) without (status))
  and
  (sum(rate(nginx_ingress_controller_requests{prometheus_from="$cluster", ingress="brand-safety-phoenix-service", status !="200"}[$__rate_interval])) without (status) > 0))
prometheusmonitoringgrafana


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