fix(vm-client): add nodename-to-IP metricRelabelConfig for node-exporter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

otc/observability.buildth.ing/stacks/observability-client/vm-client-stack/values.yaml

@@ -968,6 +968,11 @@ prometheus-node-exporter:
             - action: drop
               source_labels: [mountpoint]
               regex: "/var/lib/kubelet/pods.+"
+            - action: replace
+              source_labels: [__name__, instance]
+              regex: "node_uname_info;([^:]+):.+"
+              target_label: nodename
+              replacement: "$1"
 # -- kube-state-metrics dependency chart configuration. For possible values check [here](https://github.com/prometheus-community/helm-charts/blob/main/charts/kube-state-metrics/values.yaml)
 kube-state-metrics:
   enabled: true