CNV-46221: Add link to upstream docs metric list

Author: MirzWeiss

modules/virt-querying-metrics.adoc

@@ -6,6 +6,7 @@
 = Virtualization metrics
 
 The following metric descriptions include example Prometheus Query Language (PromQL) queries. These metrics are not an API and might change between versions.
+For a complete list of virtualization metrics, see link:https://github.com/kubevirt/monitoring/blob/main/docs/metrics.md[KubeVirt components metrics].
 
 [NOTE]
 ====