This is a simple way to customize the selection of network interfaces. If INTERFACE_NAMES_OVERRIDE is set in muninlite.conf, that list is used instead of auto-detection. As muninlite.conf
itself is also a script, it is even possible to write a custom command.
This feature is helpful in environments with virtual machines or containers, like docker or lxc where there are lots of br-*, veth*, lxcbr* etc interfaces where monitoring doesn't make much
sense. I didn't find a way to reliably filter physical interfaces.
Previously an input token with a leading hyphen (e.g. "-n") could be
inadvertently interpreted by "echo" instead of being taken literally.
No further damage was possible, but this would have been unexpected.
It's executed as shell script. For example, you can remove unwanted
plugin by adding following line to /etc/munin/muninlite.conf:
PLUGINS=${PLUGINS/ swap/}
It could also be used to add more plugins (with runtime on/off detection!),
although pluginsdir is the preferred way to do it.
It can also be used to override other hardcoded settings, like NTP_PEER or
DF_IGNORE_FILESYSTEM_REGEX.
Previously MuninLite tried to create a drop-in-replacement for
munin-node by using the same name. But MuninLite behaves differently
and may even be used in parallel to a regular munin-node setup on a host,
thus it should use a distinct name.
