kube-prometheus: Run node-exporter in host network

Node exporter needs to run in the host network, not in the pod network
in order to pick up network metrics of the node.

manifests/grafana-dashboardDatasources.yaml

@@ -2,12 +2,13 @@ apiVersion: v1
 data:
   prometheus.yaml: |-
     {
+        "apiVersion": 1,
         "datasources": [
             {
                 "access": "proxy",
                 "editable": false,
                 "name": "prometheus",
-                "org_id": 1,
+                "orgId": 1,
                 "type": "prometheus",
                 "url": "http://prometheus-k8s.monitoring.svc:9090",
                 "version": 1

manifests/node-exporter-daemonset.yaml

@@ -42,6 +42,7 @@ spec:
         name: kube-rbac-proxy
         ports:
         - containerPort: 9100
+          hostPort: 9100
           name: https
         resources:
           limits:
@@ -50,6 +51,8 @@ spec:
           requests:
             cpu: 10m
             memory: 20Mi
+      hostNetwork: true
+      hostPID: true
       nodeSelector:
         beta.kubernetes.io/os: linux
       securityContext: