Node health dashboard + fix node-exporter scrape config (role:pod, instance=node name)

manifests/monitoring/prometheus.yaml

@@ -51,16 +51,16 @@ data:
           - targets: ["localhost:9090"]
       - job_name: node-exporter
         kubernetes_sd_configs:
-          - role: node
+          - role: pod
+            selectors:
+              - role: pod
+                label: "app=node-exporter"
         relabel_configs:
-          - source_labels: [__meta_kubernetes_node_address_InternalIP]
-            target_label: instance_ip
-          - action: labelmap
-            regex: __meta_kubernetes_node_label_(.+)
-        metric_relabel_configs:
-          - source_labels: [__name__]
-            regex: go_.*
-            action: drop
+          - source_labels: [__meta_kubernetes_pod_node_name]
+            target_label: instance
+          - source_labels: [__meta_kubernetes_pod_container_port_number]
+            action: keep
+            regex: "9100"
 ---
 apiVersion: apps/v1
 kind: StatefulSet