Prometheus Adapter Custom Metrics for Libvirt in a K8S Cluster
It actually depends on how you install the Prometheus Adapter. If you install via helm and use the YAML as configuration to the rules. You need to follow this README https://github.com/helm/charts/blob/master/stable/prometheus-adapter/README.md and and declare the rules like
rules: custom: - seriesQuery: '{__name__=~"^some_metric_count$"}' resources: template: <<.Resource>> name: matches: "" as: "my_custom_metric" metricsQuery: sum(<<.Series>>{<<.LabelMatchers>>}) by (<<.GroupBy>>)Pay attention to the custom keyword. If you miss it, the number won't be available via custom metrics.