[BUG] Metrics for memory not working correctly

[gorSign]

At least for:
libvirt_domain_memory_stats_unused_bytes
libvirt_domain_memory_stats_used_percent

I got wrong values. For 1st it is 3,66GB and 2nd is 7,29%, but should be total-used=1,6Gi and 2,2/3,8*100=58%.

System output:

free -h

          total        used        free      shared  buff/cache   available

Mem: 3.8Gi 2.2Gi 197Mi 3.0Mi 1.4Gi 1.3Gi
Swap: 0B 0B 0B

cat /etc/lsb-release

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.4 LTS"

[thannaske]

Have you enabled memory statistics fetching for the balloon device? Not doing this may cause issues like that.

[gorSign]

Any hint how/where to do that please?

[gorSign]

Again...got a metrics:
libvirt_domain_memory_stats_actual_balloon_bytes{domain="xx"} 4.294967296e+09
libvirt_domain_memory_stats_available_bytes{domain="xx"} 4.11518976e+09
libvirt_domain_memory_stats_disk_cache_bytes{domain="xx"} 1.62963456e+08
libvirt_domain_memory_stats_major_fault_total{domain="xx"} 0
libvirt_domain_memory_stats_minor_fault_total{domain="xx"} 0
libvirt_domain_memory_stats_rss_bytes{domain="xx"} 0
libvirt_domain_memory_stats_unused_bytes{domain="xx"} 3.930349568e+09
libvirt_domain_memory_stats_usable_bytes{domain="xx"} 3.812745216e+09
libvirt_domain_memory_stats_used_percent{domain="xx"} 7.349467743621135

and it is on the system:

free

          total        used        free      shared  buff/cache   available

Mem: 4026324 2221720 119064 2764 1685540 1535432
Swap: 0 0 0

Where to get used/free/available? Have no idea based on metrics that got from exporter.
Also used/free=55,2% and not 7,35% as it is in libvirt_domain_memory_stats_used_percent.
Any help?

Output from libvirt:

virsh dommemstat xx --current

actual 4194304
swap_in 0
swap_out 0
major_fault 0
minor_fault 0
unused 3838232
available 4018740
usable 3723384
last_update 1666251019
disk_caches 159144
hugetlb_pgalloc 0
hugetlb_pgfail 0
rss 4244716