Add least_conn option to be used in php upstream

[heyyo-droid]

In Kubernetes environment, we use service to load balance nginx traffic accross several php-fpm traffic.
Today this load balancing is using default Round Robin algorithm.
Nginx proposes another alogirthm which checks which php-fpm use the least number of connections.
I never tried but I supposed it could help to distribute the traffic more equally according the current resources usage of php-fpm pods.

I know it's possible to create a new preset, that could define it'sown upstream config file, but I would to avoid this path, to keep the actual really configuration of drupal 11.

According what I understood we just need to add this param least_conn in the upstream block

upstream php_backend {
    # Add the least_conn directive here
    least_conn;
    
    # Use the Kubernetes Service Name (e.g., 'php-fpm-service')
    # Nginx will resolve this to the pod IPs in the Service
    server php-fpm-service:9000;
}

[csandanov]

AFAIK, this isn't going to work in Kubernetes, you need to set it up on kube-proxy level

[heyyo-droid]

But ingress proxy is for routing the traffic to nginx pods, but between nginx pods and php-fpm is ingress also involved ?