k8s: add T-Mobile Home Internet gateway prometheus exporter

Deploys tpaulus/tmobile-internet-exporter against the G4AR at
192.168.12.1, picked up by the existing kubernetes-services scrape
job via prometheus.io/scrape annotations on the Service.

home/cluster/argocd/apps/tmobile-exporter.yaml

@@ -0,0 +1,23 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: tmobile-exporter
+  namespace: argocd
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+  source:
+    repoURL: https://codeberg.org/gmcintire/infra.git
+    targetRevision: main
+    path: home/cluster/tmobile-exporter
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: monitoring
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+      - ServerSideApply=true

home/cluster/tmobile-exporter/deployment.yaml

@@ -0,0 +1,44 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: tmobile-exporter
+  namespace: monitoring
+  labels:
+    app.kubernetes.io/name: tmobile-exporter
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: tmobile-exporter
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: tmobile-exporter
+    spec:
+      containers:
+        - name: exporter
+          image: ghcr.io/tpaulus/tmobile-internet-exporter:main
+          imagePullPolicy: Always
+          args:
+            - -target=192.168.12.1
+            - -listen=:9099
+          ports:
+            - name: metrics
+              containerPort: 9099
+              protocol: TCP
+          resources:
+            requests:
+              cpu: 10m
+              memory: 16Mi
+            limits:
+              memory: 64Mi
+          securityContext:
+            runAsNonRoot: true
+            runAsUser: 65532
+            runAsGroup: 65532
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true
+            capabilities:
+              drop: ["ALL"]
+            seccompProfile:
+              type: RuntimeDefault

home/cluster/tmobile-exporter/kustomization.yaml

@@ -0,0 +1,5 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - deployment.yaml
+  - service.yaml

home/cluster/tmobile-exporter/service.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: tmobile-exporter
+  namespace: monitoring
+  labels:
+    app.kubernetes.io/name: tmobile-exporter
+  annotations:
+    prometheus.io/scrape: "true"
+    prometheus.io/port: "9099"
+    prometheus.io/job: tmobile_gateway
+spec:
+  selector:
+    app.kubernetes.io/name: tmobile-exporter
+  ports:
+    - name: metrics
+      port: 9099
+      targetPort: metrics
+      protocol: TCP