HAProxy custom metrics plugin for mackerel.io agent.
mackerel-plugin-haproxy [-host=<host>] [-port=<port>] [-path=<stats-path>] [-scheme=<http|https>] [-tempfile=<tempfile>]
or
mackerel-plugin-haproxy [-uri=<uri>] [-tempfile=<tempfile>]
[plugin.metrics.haproxy]
command = "/path/to/mackerel-plugin-haproxy -port=8000"