Add k8s configs for Kube Prometheus stack

Signed-off-by: Adrian-George Dumitrache <adriangeorge.d92@gmail.com>

README.md

@@ -14,8 +14,15 @@ This repository houses all Kubernetes configuration files for the SongRate proje
 To run the project locally, you can use Minikube. First, make sure you have it installed and running.
 
 ```bash
-minikube start
+minikube start --extra-config=kubelet.authentication-token-webhook=true \
+               --extra-config=kubelet.authorization-mode=Webhook
 minikube addons enable ingress
+minikube addons disable metrics-server
+
+helm repo add kong https://charts.konghq.com
+helm repo add portainer https://portainer.github.io/k8s/
+helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+helm repo update
 
 kubectl apply -f prerequisites/
 kubectl apply -f kong/
@@ -23,23 +30,28 @@ kubectl apply -f adminer/
 kubectl apply -f database/
 
 # Install Kong ingress controller
-helm repo add kong https://charts.konghq.com
-helm repo update
 helm install kong kong/ingress -n kong --create-namespace
 
 # Install Portainer
-helm repo add portainer https://portainer.github.io/k8s/
-helm repo update
-helm upgrade --install portainer portainer/portainer --set image.tag=lts
+helm install portainer portainer/portainer --set image.tag=lts
 kubectl apply -f portainer/
 
+
+helm install prometheus prometheus-community/kube-prometheus-stack \
+    --namespace monitoring --create-namespace --version 45.7.1 \
+    -f grafana/grafana-values.yaml -f prometheus/prometheus-values.yaml
+
+kubectl apply -f prometheus/
+kubectl apply -f grafana/
+
 minikube tunnel # this will require root privileges and will block the terminal
 ```
 
 Then acquire the Kong Proxy IP address:
 
 ```bash
-export PROXY_IP=$(kubectl get svc --namespace kong kong-gateway-proxy -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
+export PROXY_IP=$(kubectl get svc --namespace kong kong-gateway-proxy \
+-o jsonpath='{.status.loadBalancer.ingress[0].ip}')
 echo $PROXY_IP
 ```
 

grafana/grafana-ingress.yaml

+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: grafana-ingress
+  namespace: monitoring
+  annotations:
+    konghq.com/strip-path: "true"  # Strip the /grafana prefix
+    konghq.com/plugins: "request-transformer"
+    konghq.com/request-transformer: |
+      config:
+        add:
+          headers:
+            - X-Forwarded-Prefix:/grafana
+spec:
+  ingressClassName: kong
+  rules:
+  - http:
+      paths:
+      - path: /grafana
+        pathType: Prefix
+        backend:
+          service:
+            name: prometheus-grafana
+            port:
+              number: 80
\ No newline at end of file

grafana/grafana-values.yaml

+grafana:
+  env:
+    GF_SERVER_ROOT_URL: "%(protocol)s://%(domain)s/grafana"
+    GF_SERVER_SERVE_FROM_SUB_PATH: "true"

prometheus/prometheus-ingress.yaml

+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: prometheus-ingress
+  namespace: monitoring
+  annotations:
+    konghq.com/strip-path: "false"  # Do not strip the /prometheus prefix
+spec:
+  ingressClassName: kong
+  rules:
+  - http:
+      paths:
+      - path: /prometheus
+        pathType: Prefix
+        backend:
+          service:
+            name: prometheus-operated
+            port:
+              number: 9090

prometheus/prometheus-values.yaml

+prometheus:
+  prometheusSpec:
+    externalUrl: /prometheus
+    routePrefix: /prometheus