/etc/munin/plugin-conf.d/libvirt is in virt-goodies 0.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [libvirt]
# URI for libvirt
env.uri "qemu:///system"
# Force a set of domains to the bottom of the graph (can severely prettify the output)
# Example: env.force_order = "['mysql', 'mail']"
env.force_order []
# One of "stacked" or "line"
env.graph_type "stacked"
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