Some hosts may not need this plugin, or may not have it installed.
Notably, it is not needed or used on my systems based on Buildroot,
since the only current use case for it is to keep track of the Fedora
version.
The *unixsock* plugin for *collectd* provides a socket-based interface
that other software can use to communicate with *collectd*. Notably,
this can be used to publish custom values, query existing values, and
flush caches.
The socket is created at `/run/collectd/socket`. The `/run/collectd`
directory is managed by systemd; it will be created automatically when
the service starts and cleaned up when it stops.
