Is it the granularity of the health check that you're wondering about? I've got a deployment where nginx delegates the health check / load balance component to

Is it the granularity of the health check that you're wondering about? I've got a deployment where nginx delegates the health check / load balance component to haproxy. Keep in mind that the "heavier duty" the health check, the less frequently it can be run at scale. edit: The best clue is probably the phrase "available as part of our commercial subscription only" appearing all over the upstream module documentation.[0] [0] http://nginx.org/en/docs/http/ngx_http_upstream_module.html http://nginx.org/en/docs/http/ngx_http_upstream_module.html