[New feature] Added Prometheus example for metrics

prometheus/Dockerfile

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+FROM prom/prometheus
+
+COPY prometheus.yml /etc/prometheus

prometheus/daemonset.yml

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+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: prometheus
+  namespace: default
+  labels:
+    name: prometheus
+spec:
+  selector:
+    matchLabels:
+      name: prometheus
+  updateStrategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 10%
+  template:
+    metadata:
+      labels:
+        name: prometheus
+    spec:
+      dnsPolicy: ClusterFirst
+      hostNetwork: true
+      containers:
+        - name: prometheus
+          image: prometheus-zevenet
+          imagePullPolicy: IfNotPresent
+          ports:
+          - containerPort: 9090
+          resources:
+            limits:
+              memory: 200Mi
+            requests:
+              cpu: 100m
+              memory: 200Mi
+          securityContext:
+            privileged: true

prometheus/prometheus.yml

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+global:
+  scrape_interval: 15s
+  scrape_timeout: 10s
+  evaluation_interval: 15s
+scrape_configs:
+- job_name: kube-nftlb
+  scrape_interval: 1s
+  static_configs:
+  - targets:
+    - localhost:9195