Also track libvirt/images separately

dotfiles/i3status.conf

 order += "battery 1"
 order += "load"
 order += "cpu_usage"
+order += "disk /var/lib/libvirt/images"
 order += "disk /"
 order += "disk /home"
 order += "volume master"
     format = "%Y-%m-%d %H:%M"
 }
 
+disk "/var/lib/libvirt/images/" {
+    format = "virt:%avail"
+    threshold_type = "gbytes_avail"
+    low_threshold = 2
+}
+
 disk "/" {
     format = "/:%avail"
     threshold_type = "gbytes_avail"