I was hoping the article describe how to perform the application restart without dropping a single incoming connections when a new service instance receives the

I was hoping the article describe how to perform the application restart without dropping a single incoming connections when a new service instance receives the listening socket from the old instance. It is relatively straightforward to implement under systemd. And nginx has been supporting that for over 20 years. Sadly Kuberenets and Docker have no support for that assuming it is done in load balancer or the reverse proxy.