Re: How to monitor domains in regards steal time and other important metrics (VIR_DOMAIN_STATS_VCPU) ?

> Libvirt exposes per VCPU stats for domains via [6]. I'd like to be able to > export those via the exporter. > One important metric to me would be things like the steal time > (vcpu.<num>.delay), to determine is domains are starting to get cut short or > even starve > on cpu time. Apparently those metrics are / cannot be expose anymore since > the switch to CGroupsV2? Reading [7] or [8] others seem to have run into > this. I just tested that upstream libvirt on system with cgroups v2 reports vcpu.<num>.delay as this stat is not taken from cgroups at all, we use `/proc` for it. The stats you are asking for can be obtained using the libvirt API virConnectGetAllDomainStats [10]. The bugs you mentioned are talking about different stat, it affects different API virDomainGetCPUStats [11]. > Is this actually still the case, even for more recent kernels? If so, I am > wondering if there is an issue being tracked to implement this > functionality? As far as I know it is still the case there is no replacement for cpuacct.usage_percpu in cgroups v2, but that should not affect the data you seem to be consuming from libvirt.