Opening fd custom metrics plugin for mackerel.io agent.
This plugin monitors /proc/[pid]/fd/*
to count file descriptors.
Now this plugin posts only the maximum number of opening fd in matching processes.
mackerel-plugin-proc-fd -process=<process name>
[plugin.metrics.proc-fd]
command = "/path/to/mackerel-plugin-proc-fd -process='keepalived'"