feat(metrics): Add metric scraping

Add ServiceMonitor resource to scrape /metrics endpoint.
Said endpoint cannot be scrapped from outside of the cluster, as a special IngressRoute Middleware prevents the exposition of said endpoint.

README.md

@@ -2,3 +2,4 @@
 
 Front end for Git, with integrated Container Registry and CI/CD capabilities.
 This repository only contains configuration used for Kubernetes.
+

manifests/configmap.yaml

@@ -9,6 +9,7 @@ data:
   GITEA__server__DISABLE_SSH: "true"
   GITEA__security__INSTALL_LOCK: "true"
   GITEA__service__DISABLE_REGISTRATION: "true"
+  GITEA__metrics__ENABLED: "true"
   #app.ini: |
   #  APP_NAME = K8s implementation
   #  RUN_MODE = prod

manifests/ingress.yaml

@@ -1,23 +1,29 @@
-apiVersion: networking.k8s.io/v1
-kind: Ingress
+apiVersion: traefik.containo.us/v1alpha1
+kind: Middleware
 metadata:
-    name: gitea-ingress
-    namespace: gitea
-    annotations:
-        kubernetes.io/ingress.class: "traefik"
+  name: replace-regex
+  namespace: gitea
 spec:
-    tls:
-      - secretName: gitea-beta-tls
-        hosts:
-            - git.beta.halia.dev
-    rules:
-      - host: git.beta.halia.dev
-        http:
-            paths:
-              - path: /
-                pathType: Prefix
-                backend:
-                    service:
-                        name: gitea-svc
-                        port:
-                            number: 80
+  replacePathRegex:
+    regex: "^/metrics"
+    replacement: "/"
+
+---
+apiVersion: traefik.containo.us/v1alpha1
+kind: IngressRoute
+metadata:
+  name: gitea-ingress
+  namespace: gitea
+  annotations:
+      kubernetes.io/ingress.class: "traefik"
+spec:
+  entryPoints:
+    - websecure
+  routes:
+  - match: Host(`git.beta.halia.dev`) && PathPrefix(`/`)
+    kind: Rule
+    middlewares:
+      - name: replace-regex
+    services:
+    - name: gitea-svc
+      port: 80

manifests/kustomization.yaml

@@ -5,6 +5,7 @@ resources:
   - namespace.yaml
   - database.yaml
   - service.yaml
+  - servicemonitor.yaml
   - ingress.yaml
   - configmap.yaml
   - admin-creator.yaml

manifests/service.yaml

@@ -3,6 +3,8 @@ kind: Service
 metadata:
     name: gitea-svc
     namespace: gitea
+    labels:
+      app.kubernetes.io/name: gitea
 spec:
     ports:
         - name: http

manifests/servicemonitor.yaml

@@ -0,0 +1,14 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: gitea
+  namespace: gitea
+  labels:
+    team: core
+spec:
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: gitea
+  endpoints:
+    - port: http
+      path: /metrics