feat: collect node-exporter metrics from essential box

cluster/apps/monitoring/external-monitors/essential-node-exporter.yaml

@@ -0,0 +1,47 @@
+kind: Service
+apiVersion: v1
+metadata:
+  name: essential-node-exporter
+  namespace: monitoring
+  labels:
+    app: essential-node-exporter
+spec:
+  type: ClusterIP
+  ports:
+  - name: metrics
+    port: 9100
+    targetPort: 9100
+---
+kind: Endpoints
+apiVersion: v1
+metadata:
+  name: essential-node-exporter
+  namespace: monitoring
+subsets:
+- addresses:
+  - ip: 192.168.10.41
+  ports:
+  - name: metrics
+    port: 9100
+---
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: essential-node-exporter
+  namespace: monitoring
+  labels:
+    release: kube-prometheus-stack
+spec:
+  selector:
+    matchLabels:
+      app: essential-node-exporter
+  endpoints:
+  - port: metrics
+    interval: 60s
+    scrapeTimeout: 15s
+    path: /metrics
+    relabelings:
+    - targetLabel: job
+      replacement: node-exporter
+    - targetLabel: instance
+      replacement: essential

cluster/apps/monitoring/external-monitors/kustomization.yaml

@@ -3,3 +3,4 @@ kind: Kustomization
 resources:
 - ./air-quality.yaml
 - ./air-quality-dashboard.yaml
+- ./essential-node-exporter.yaml