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If libvirt is configured with auth_unix_rw="sasl" the connect logic needs to use auth parameters. This logic is not part of current collectd-virt plugin. Therefore, the plugin does not do anything if sasl is set.
Can you please report this upstream? https://github.com/collectd/collectd/issues
https://github.com/collectd/collectd/issues/1926
Thank you. Since this RFE is not EPEL-specific I'd rather track it upstream.