Prometheus Latency Metric Not Available or Configurable

I’m struggling to configure the Prometheus metric [controller_upstream_server_response_latency_ms_count](https://docs.nginx.com/nginx-ingress-controller/logging-and-monitoring/prometheus/#available-metrics) with (app-routing-nginx-configuration)[https://learn.microsoft.com/en-us/azure/aks/app-routing-nginx-configuration?tabs=azurecli#configuration-of-the-nginx-ingress-controller].

It seems that the --enable-latency-metrics flag is not available. Is this metric supported in Azure App Routing? If not, is there an alternative way to gather upstream latency metrics?

Thanks in advance!

Start with the linked Prometheus available-metrics documentation and the Azure App Routing NGINX configuration guide. Check whether --enable-latency-metrics and controller_upstream_server_response_latency_ms_count are exposed or configurable in this operator. Done means documenting support status and, if unsupported, identifying a verified alternative for upstream latency metrics.

Written by the indexing model from the issue text.