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:
      securityContext:
        runAsNonRoot: true
        seccompProfile:
          type: RuntimeDefault
      containers:
        # json_exporter scrapes the gateway JSON on demand and exposes /probe.
        # The nginx sidecar below rewrites the public /metrics URL onto it.
        - name: json-exporter
          image: quay.io/prometheuscommunity/json-exporter:v0.7.0
          args:
            - --config.file=/etc/json_exporter/json-exporter.yml
          ports:
            - name: probe
              containerPort: 7979
              protocol: TCP
          resources:
            requests:
              cpu: 10m
              memory: 24Mi
            limits:
              memory: 96Mi
          securityContext:
            runAsUser: 65534
            runAsGroup: 65534
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop: ["ALL"]
          volumeMounts:
            - name: config
              mountPath: /etc/json_exporter
              readOnly: true

        # nginx rewrites GET /metrics → GET /probe?module=tmhi&target=<gateway>.
        # nginxinc/nginx-unprivileged runs as UID 101 (non-root) without file caps,
        # so it survives no_new_privs + readOnlyRootFilesystem cleanly.
        - name: nginx
          image: nginxinc/nginx-unprivileged:1.27-alpine-slim
          ports:
            - name: metrics
              containerPort: 9099
              protocol: TCP
          resources:
            requests:
              cpu: 10m
              memory: 16Mi
            limits:
              memory: 64Mi
          securityContext:
            runAsUser: 101
            runAsGroup: 101
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop: ["ALL"]
          volumeMounts:
            - name: config
              mountPath: /etc/nginx/nginx.conf
              subPath: nginx.conf
              readOnly: true
            - name: nginx-tmp
              mountPath: /tmp
          readinessProbe:
            httpGet:
              path: /healthz
              port: metrics
            periodSeconds: 10
          livenessProbe:
            httpGet:
              path: /healthz
              port: metrics
            periodSeconds: 30
      volumes:
        - name: config
          configMap:
            name: tmobile-exporter-config
        - name: nginx-tmp
          emptyDir: {}