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Update README
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@AlexZzz
AlexZzz committed Jul 23, 2021
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The following metrics/labels are being exported:

```
libvirt_domain_block_meta{bus="...",cache="...",discard="...",disk_type="...",domain="...",driver_type="...",serial="...",source_file="...",target_device="..."}
libvirt_domain_block_stats_allocation{domain="-...",target_device="..."}
libvirt_domain_block_stats_capacity{domain="-...",target_device="..."}
libvirt_domain_block_stats_flush_requests_total{domain="-...",target_device="..."}
libvirt_domain_block_stats_flush_time_seconds_total{domain="-...",target_device="..."}
libvirt_domain_block_stats_physicalsize_bytes{domain="-...",target_device="..."}
libvirt_domain_block_stats_read_bytes_total{domain="-...",target_device="..."}
libvirt_domain_block_stats_read_requests_total{domain="-...",target_device="..."}
libvirt_domain_block_stats_read_time_seconds_total{domain="-...",target_device="..."}
libvirt_domain_block_stats_write_bytes_total{domain="-...",target_device="..."}
libvirt_domain_block_stats_write_requests_total{domain="-...",target_device="..."}
libvirt_domain_block_stats_write_time_seconds_total{domain="-...",target_device="..."}
libvirt_domain_block_meta{bus="scsi",cache="none",discard="unmap",disk_type="network",domain="instance-00000337",driver_type="raw",serial="5f1a922c-e4b5-4020-9308-d70fd8219ac8",source_file="somepool/volume-5f1a922c-e4b5-4020-9308-d70fd8219ac8",target_device="sda"} 1
libvirt_domain_block_stats_allocation{domain="instance-00000337",target_device="sda"} 2.1474816e+10
libvirt_domain_block_stats_capacity_bytes{domain="instance-00000337",target_device="sda"} 2.147483648e+10
libvirt_domain_block_stats_flush_requests_total{domain="instance-00000337",target_device="sda"} 5.153142e+06
libvirt_domain_block_stats_flush_time_seconds_total{domain="instance-00000337",target_device="sda"} 473.56850521
libvirt_domain_block_stats_limit_burst_length_read_requests_seconds{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_length_total_requests_seconds{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_length_write_requests_seconds{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_read_bytes{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_read_bytes_length_seconds{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_read_requests{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_total_bytes{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_total_bytes_length_seconds{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_total_requests{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_write_bytes{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_write_bytes_length_seconds{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_burst_write_requests{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_read_bytes{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_read_requests{domain="instance-00000337",target_device="sda"} 640
libvirt_domain_block_stats_limit_total_bytes{domain="instance-00000337",target_device="sda"} 1.572864e+08
libvirt_domain_block_stats_limit_total_requests{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_write_bytes{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_limit_write_requests{domain="instance-00000337",target_device="sda"} 320
libvirt_domain_block_stats_physicalsize_bytes{domain="instance-00000337",target_device="sda"} 2.147483648e+10
libvirt_domain_block_stats_read_bytes_total{domain="instance-00000337",target_device="sda"} 1.7704034304e+11
libvirt_domain_block_stats_read_requests_total{domain="instance-00000337",target_device="sda"} 1.9613982e+07
libvirt_domain_block_stats_read_time_seconds_total{domain="instance-00000337",target_device="sda"} 161803.085086353
libvirt_domain_block_stats_size_iops_bytes{domain="instance-00000337",target_device="sda"} 0
libvirt_domain_block_stats_write_bytes_total{domain="instance-00000337",target_device="sda"} 9.2141217792e+11
libvirt_domain_block_stats_write_requests_total{domain="instance-00000337",target_device="sda"} 2.8434899e+07
libvirt_domain_block_stats_write_time_seconds_total{domain="instance-00000337",target_device="sda"} 530522.437009019
libvirt_domain_info_cpu_time_seconds_total{domain="-..."}
libvirt_domain_info_maximum_memory_bytes{domain="-..."}
libvirt_domain_info_memory_usage_bytes{domain="-..."}
libvirt_domain_info_meta{domain="...",flavor="...",instance_name="...",project_name="...",project_uuid="...",root_type="...",root_uuid="...",user_name="...",user_uuid="...",uuid="..."}
libvirt_domain_info_virtual_cpus{domain="..."}
libvirt_domain_info_vstate{domain="..."}
libvirt_domain_info_cpu_time_seconds_total{domain="instance-00000337"} 949422.12
libvirt_domain_info_maximum_memory_bytes{domain="instance-00000337"} 8.589934592e+09
libvirt_domain_info_memory_usage_bytes{domain="instance-00000337"} 8.589934592e+09
libvirt_domain_info_meta{domain="instance-00000337",flavor="someflavor-8192",instance_name="name.of.instance.com",project_name="instance.com",project_uuid="3051f6f46d394ab98f55a0670ae5c70b",root_type="image",root_uuid="155e5ab9-d28c-48f2-bd8d-f193d0a6128a",user_name="master_admin",user_uuid="240270fa2a3e4fd3baa6d6e776669b19",uuid="1bac351f-242e-4d53-8cf3-fd91b061069c"} 1
libvirt_domain_info_virtual_cpus{domain="instance-00000337"} 2
libvirt_domain_info_vstate{domain="instance-00000337"} 1
libvirt_domain_interface_meta{virtual_interface="...",domain="...",source_bridge="...",target_device="..."}
libvirt_domain_interface_stats_receive_bytes_total{domain="...",target_device="..."}
libvirt_domain_interface_stats_receive_drops_total{domain="...",target_device="..."}
libvirt_domain_interface_stats_receive_errors_total{domain="...",target_device="..."}
libvirt_domain_interface_stats_receive_packets_total{domain="...",target_device="..."}
libvirt_domain_interface_stats_transmit_bytes_total{domain="...",target_device="..."}
libvirt_domain_interface_stats_transmit_drops_total{domain="...",target_device="..."}
libvirt_domain_interface_stats_transmit_errors_total{domain="...",target_device="..."}
libvirt_domain_interface_stats_transmit_packets_total{domain="...",target_device="..."}
libvirt_domain_interface_meta{domain="instance-00000337",source_bridge="br-int",target_device="tapa7e2fe95-a7",virtual_interface="a7e2fe95-a7cf-4bec-8180-d835cf342d72"} 1
libvirt_domain_interface_stats_receive_bytes_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 7.9182281e+09
libvirt_domain_interface_stats_receive_drops_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 0
libvirt_domain_interface_stats_receive_errors_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 0
libvirt_domain_interface_stats_receive_packets_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 4.378193e+06
libvirt_domain_interface_stats_transmit_bytes_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 1.819996331e+09
libvirt_domain_interface_stats_transmit_drops_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 0
libvirt_domain_interface_stats_transmit_errors_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 0
libvirt_domain_interface_stats_transmit_packets_total{domain="instance-00000337",target_device="tapa7e2fe95-a7"} 2.275386e+06
libvirt_domain_memory_stats_actual_balloon_bytes{domain="..."}
libvirt_domain_memory_stats_available_bytes{domain="..."}
libvirt_domain_memory_stats_disk_cache_bytes{domain="..."}
libvirt_domain_memory_stats_major_fault_total{domain="..."}
libvirt_domain_memory_stats_minor_fault_total{domain="..."}
libvirt_domain_memory_stats_rss_bytes{domain="..."}
libvirt_domain_memory_stats_unused_bytes{domain="..."}
libvirt_domain_memory_stats_usable_bytes{domain="..."}
libvirt_domain_memory_stats_used_percent{domain="..."}
libvirt_domain_memory_stats_actual_balloon_bytes{domain="instance-00000337"} 8.589934592e+09
libvirt_domain_memory_stats_available_bytes{domain="instance-00000337"} 8.363945984e+09
libvirt_domain_memory_stats_disk_cache_bytes{domain="instance-00000337"} 0
libvirt_domain_memory_stats_major_fault_total{domain="instance-00000337"} 3.34448e+06
libvirt_domain_memory_stats_minor_fault_total{domain="instance-00000337"} 5.6630255354e+10
libvirt_domain_memory_stats_rss_bytes{domain="instance-00000337"} 8.7020544e+09
libvirt_domain_memory_stats_unused_bytes{domain="instance-00000337"} 7.72722688e+08
libvirt_domain_memory_stats_usable_bytes{domain="instance-00000337"} 2.27098624e+09
libvirt_domain_memory_stats_used_percent{domain="instance-00000337"} 72.84790881786736
libvirt_versions_info{hypervisor_running="...",libvirtd_running="...",libvirt_library="..."}
libvirt_up
libvirt_domain_vcpu_cpu{domain="instance-00000337",vcpu="0"} 7
libvirt_domain_vcpu_delay_seconds_total{domain="instance-00000337",vcpu="0"} 880.985415109
libvirt_domain_vcpu_state{domain="instance-00000337",vcpu="0"} 1
libvirt_domain_vcpu_time_seconds_total{domain="instance-00000337",vcpu="0"} 315190.41
libvirt_domain_vcpu_wait_seconds_total{domain="instance-00000337",vcpu="0"} 0
libvirt_up 1
```

## Libvirt/qemu version notice
Some of the above might be exposed only with:

`libvirt >= v7.2.0`:
libvirt_domain_vcpu_delay_seconds_total

# Historical
Project forked from https://github.com/kumina/libvirt_exporter and substantially rewritten.
Implemented support for several additional metrics, ceph rbd (and network block devices), ovs.
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