Nginx custom metrics plugin for mackerel.io agent.
mackerel-plugin-nginx [-header=<header>] [-host=<host>] [-path=<path>] [-port=<port>] [-scheme=<'http'|'https'>] [-tempfile=<tempfile>] [-uri=<uri>]
[plugin.metrics.nginx]
command = "/path/to/mackerel-plugin-nginx"