Nginx deployment for Kubernetes with Prometheus monitoring

k8s-nginx-deployment.yml

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx
  namespace: default
data:
  nginx.conf: |
    worker_processes auto;

    events {
      worker_connections 1024;
    }

    http {
      # Hide nginx version information.
      server_tokens off;
      gzip on;
      # Compression level (1-9).
      # 5 is a perfect compromise between size and CPU usage, offering about
      # 75% reduction for most ASCII files (almost identical to level 9).
      gzip_comp_level    5;
      # Don't compress anything that's already small and unlikely to shrink much
      # if at all (the default is 20 bytes, which is bad as that usually leads to
      # larger files after gzipping).
      # Default: 20
      gzip_min_length    256;
      # Tell proxies to cache both the gzipped and regular version of a resource
      # whenever the client's Accept-Encoding capabilities header varies;
      # Avoids the issue where a non-gzip capable client (which is extremely rare
      # today) would display gibberish if their proxy gave them the gzipped version.
      # Default: off
      gzip_vary          on;

      server {
        listen 80 default_server;
        listen [::]:80 default_server;

        root /usr/share/nginx/html/;

        location / {
          access_log off;
          try_files $uri $uri/ =404;
        }
      }

      server {
        server_name metrics;
        listen 8088;
        listen [::]:8088;

        location /probes/health {
          access_log off;
          return 200 "healthy";
        }

        location /nginx_status {
            access_log off;
            stub_status;
        }
      }
    }
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx
  namespace: default
  labels:
    app: nginx
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/path: "/metrics"
        prometheus.io/port: "9113"
    spec:
      volumes:
      - name: config
        configMap:
          name: nginx
      imagePullSecrets:
        - name: platform-docker-registry
      containers:
        - name: nginx 
          image: nginx:1.15.2
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 80
          volumeMounts:           
          - name: config
            mountPath: /etc/nginx
          readinessProbe:
            httpGet:
              path: /probes/health
              port: 8088
            initialDelaySeconds: 5
            timeoutSeconds: 5
            periodSeconds: 5
            failureThreshold: 3
            successThreshold: 1
          livenessProbe:
            httpGet:
              path: /probes/health
              port: 8088
            initialDelaySeconds: 5
            timeoutSeconds: 5
            periodSeconds: 15
            failureThreshold: 3
            successThreshold: 1
        - name: metrics
          image: nginx/nginx-prometheus-exporter:0.1.0
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 9113
          args: [
            "-nginx.scrape-uri", "http://localhost:8088/nginx_status"
          ]