Add documentation to install prometheus and grafana

deploy/monitoring/configuration.yaml

@@ -0,0 +1,41 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: prometheus-configuration
+  labels:
+    name: prometheus-configuration
+  namespace: ingress-nginx
+data:
+  prometheus.yml: |-
+    global:
+      scrape_interval: 10s
+    scrape_configs:
+    - job_name: 'ingress-nginx-endpoints'
+      kubernetes_sd_configs:
+      - role: pod
+        namespaces:
+          names:
+          - ingress-nginx
+
+      relabel_configs:
+      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
+        action: keep
+        regex: true
+      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scheme]
+        action: replace
+        target_label: __scheme__
+        regex: (https?)
+      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
+        action: replace
+        target_label: __metrics_path__
+        regex: (.+)
+      - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
+        action: replace
+        target_label: __address__
+        regex: ([^:]+)(?::\d+)?;(\d+)
+        replacement: $1:$2
+
+      - source_labels: [__meta_kubernetes_service_name]
+        regex: prometheus-service
+        action: drop
+