Add Pure FlashArray OpenMetrics exporter to monitoring namespace

- Deploy purestorage/pure-fa-om-exporter:v1.0.27 container
- Configure API token secret for utilidor FlashArray (jarvis user)
- Expose /metrics endpoint via ClusterIP service on port 9490
- ServiceMonitor for kube-prometheus-stack auto-discovery
- ArgoCD application for GitOps deployment (wave 3)
- Scrape interval: 60s (storage metrics low frequency)
- Resource limits: 200m CPU / 128Mi memory

Provides pure_* metrics namespace for FlashArray capacity, performance,
volume stats, host connectivity, etc.

cluster/platform/pure-exporter/deployment.yaml

@@ -0,0 +1,90 @@
+# ------------------------------------------------------------------------------
+# Pure FlashArray OpenMetrics Exporter - Deployment
+#
+# Provides Prometheus-scrapable metrics from Pure Storage FlashArray
+# Polls FlashArray API and exposes /metrics endpoint for Prometheus ServiceMonitor
+#
+# Container: quay.io/purestorage/pure-fa-om-exporter (official image)
+# Port: 9490 (standard exporter port)
+# Config: tokens.yaml mounted from Secret
+# ------------------------------------------------------------------------------
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pure-fa-exporter
+  namespace: monitoring
+  labels:
+    app.kubernetes.io/name: pure-fa-exporter
+    app.kubernetes.io/component: metrics
+    app.kubernetes.io/part-of: monitoring
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: pure-fa-exporter
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: pure-fa-exporter
+        app.kubernetes.io/component: metrics
+    spec:
+      containers:
+      - name: exporter
+        image: quay.io/purestorage/pure-fa-om-exporter:v1.0.27
+        imagePullPolicy: IfNotPresent
+        
+        # Command args - point to tokens file
+        args:
+          - --port=9490
+          - --tokens=/etc/pure-exporter/tokens.yaml
+        
+        ports:
+        - name: metrics
+          containerPort: 9490
+          protocol: TCP
+        
+        # Resource limits (exporter is lightweight)
+        resources:
+          requests:
+            cpu: 50m
+            memory: 64Mi
+          limits:
+            cpu: 200m
+            memory: 128Mi
+        
+        # Health checks
+        livenessProbe:
+          httpGet:
+            path: /
+            port: metrics
+          initialDelaySeconds: 10
+          periodSeconds: 30
+          timeoutSeconds: 5
+          
+        readinessProbe:
+          httpGet:
+            path: /
+            port: metrics
+          initialDelaySeconds: 5
+          periodSeconds: 10
+          timeoutSeconds: 5
+        
+        # Mount tokens.yaml from secret
+        volumeMounts:
+        - name: tokens
+          mountPath: /etc/pure-exporter
+          readOnly: true
+      
+      volumes:
+      - name: tokens
+        secret:
+          secretName: pure-fa-exporter-token
+          items:
+          - key: tokens.yaml
+            path: tokens.yaml
+      
+      # Security context
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 65534
+        fsGroup: 65534