enable prometheus ports, configure prometheus server

manifests/pleroma/service.yaml

@@ -7,8 +7,13 @@ metadata:
 spec:
   ports:
     - port: 80
+      name: http
       targetPort: 4000
       protocol: TCP
+    - port: 4021
+      name: prometheus
+      targetPort: 4021
+      protocol: TCP
   selector:
     app: pleroma
 ---

manifests/pleroma/templates/deployment.yaml

@@ -100,6 +100,7 @@ spec:
         command: ["sh", "-c", "elixir --sname pleroma -S mix phx.server --no-compile"]
         ports:
         - containerPort: 4000
+        - containerPort: 4021
         env:
         - name: MIX_ENV
           value: prod

manifests/prometheus/configmap.yaml

@@ -0,0 +1,16 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  namespace: darkdork-dev
+  name: prometheus-config
+data:
+  prometheus.yaml: |
+    global:
+      scrape_interval: 15s
+
+    scrape_configs:
+      - job_name: 'pleroma'
+        scheme: http
+        static_configs:
+        - targets: ['pleroma:4021']

manifests/prometheus/deployment.yaml

@@ -0,0 +1,40 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: prometheus
+  namespace: darkdork-dev
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: prometheus
+  template:
+    metadata:
+      labels:
+        app: prometheus
+    spec:
+      imagePullSecrets:
+        - name: registry-credentials
+      containers:
+      - name: prometheus
+        image: prom/prometheus
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 9090
+        volumeMounts:
+        - name: prometheus-data
+          mountPath: /prometheus
+        - name: prometheus-config
+          mountPath: /etc/prometheus/prometheus.yaml
+          subPath: prometheus.yaml
+      volumes:
+      - name: prometheus-data
+        persistentVolumeClaim:
+          claimName: prometheus-pvc
+      - name: prometheus-config
+        configMap:
+          name: prometheus-config
+      securityContext:
+        fsGroup: 1000
+---

manifests/prometheus/ingress.yaml

@@ -0,0 +1,20 @@
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: prometheus
+  namespace: darkdork-dev
+spec:
+  ingressClassName: nginx
+  rules:
+  - host: darkdork.prometheus.lan
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: prometheus
+            port:
+              number: 9090
+---

manifests/prometheus/pvc.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: prometheus-pvc
+  namespace: darkdork-dev
+  labels:
+    app: prometheus
+spec:
+  storageClassName: longhorn-ssd
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage:
+        10Gi
+---

manifests/prometheus/service.yaml

@@ -0,0 +1,15 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: prometheus
+  namespace: darkdork-dev
+spec:
+  ports:
+    - port: 9090
+      name: prometheus
+      targetPort: 9090
+      protocol: TCP
+  selector:
+    app: prometheus
+---