=head2 Plugin C<fhcount>
The C<fhcount> plugin provides statistics about used, unused and total number of
-file handles.
+file handles on Linux.
The I<fhcount plugin> provides the following configuration options:
B<uuid> means use the guest's UUID.
+You can also specify combinations of these fields. For example B<name uuid>
+means to concatenate the guest name and UUID (with a literal colon character
+between, thus I<"foo:1234-1234-1234-1234">).
+
=back
=head2 Plugin C<vmem>