NewNginxProc collects metrics about nginx and nginx child processes.

This is to output a static "nginx.status = 0" metric if NGINX is not running or detected or NGINX Plus API or stub_status API is not setup properly.

NewNginxWorker collects metrics about nginx child processes.

NginxPlus generates metrics from NGINX Plus API.

NginxWorkerClient allows you to fetch NGINX worker metrics from psutil via the PID of the master procs it implements an interface that we can mock for testing.

Workers represents metrics related to child nginx processes.

WorkerStats represents NGINX worker metrics.