ICMP Ping RTT custom metrics plugin for mackerel-agent.
$ sudo ./mackerel-plugin-ping -host 8.8.8.8
# Or you can use multi-host format
$ sudo ./mackerel-plugin-ping -host 8.8.8.8,8.8.4.4
[plugin.metrics.ping]
command = "/path/to/mackerel-plugin-ping -host 8.8.8.8"