Add dotnet counters & prometheus service monitor to k8s example (#849)

Author: jvyden

kube/db.yml

@@ -7,7 +7,7 @@ spec:
     - ReadWriteOnce
   resources:
     requests:
-      storage: 4Gi
+      storage: 1Gi
 ---
 apiVersion: v1
 kind: ConfigMap

kube/deployment.yaml

@@ -14,7 +14,7 @@ spec:
     spec:
       containers:
         - name: refresh-gameserver
-          image: ghcr.io/littlebigrefresh/refresh-postgres-beta:main
+          image: ghcr.io/littlebigrefresh/refresh:latest
           imagePullPolicy: Always
           ports:
             - containerPort: 10061
@@ -23,9 +23,13 @@ spec:
               value: /refresh/data
             - name: POSTGRES_CONNECTION_STRING
               value: Database=refresh;Username=refresh;Password=refresh;Host=refresh-db;Port=5432
+            - name: DOTNET_DiagnosticPorts
+              value: "/diag/dotnet-monitor.sock,connect,suspend"
           volumeMounts:
             - name: gameserver-data
               mountPath: /refresh/data
+            - name: diagvol
+              mountPath: /diag
           livenessProbe:
             httpGet:
               path: /_health
@@ -34,7 +38,43 @@ spec:
             periodSeconds: 5
             timeoutSeconds: 3
             failureThreshold: 5
+        - name: monitor
+          image: mcr.microsoft.com/dotnet/monitor:9.0
+          ports:
+            - containerPort: 52323
+            - containerPort: 52325
+          securityContext:
+            runAsUser: 1001
+          # DO NOT use the --no-auth argument for deployments in production; this argument is used for demonstration
+          # purposes only in this example. Please continue reading after this example for further details.
+          args: [ "collect", "--no-auth" ]
+          imagePullPolicy: Always
+          env:
+            - name: DOTNETMONITOR_DiagnosticPort__ConnectionMode
+              value: Listen
+            - name: DOTNETMONITOR_Storage__DefaultSharedPath
+              value: /diag
+            # ALWAYS use the HTTPS form of the URL for deployments in production; the removal of HTTPS is done for
+            # demonstration purposes only in this example. Please continue reading after this example for further details.
+            - name: DOTNETMONITOR_Urls
+              value: http://localhost:52323
+            # The metrics URL is set in the CMD instruction of the image by default. However, this deployment overrides that with the args setting; manually set the URL to the same value using configuration.
+            - name: DOTNETMONITOR_Metrics__Endpoints
+              value: http://+:52325
+          volumeMounts:
+            - mountPath: /diag
+              name: diagvol
+          resources:
+            requests:
+              cpu: 50m
+              memory: 32Mi
+            limits:
+              cpu: 250m
+              memory: 256Mi
       volumes:
         - name: gameserver-data
           persistentVolumeClaim:
             claimName: gameserver-pvc
+        - name: diagvol
+          emptyDir:
+            medium: "Memory"

kube/pvc.yaml

@@ -7,4 +7,4 @@ spec:
     - ReadWriteOnce
   resources:
     requests:
-      storage: 25Gi
+      storage: 10Gi

kube/service.yaml

@@ -2,11 +2,20 @@
 kind: Service
 metadata:
   name: refresh-gameserver
+  namespace: refresh
+  labels:
+    app: refresh-gameserver
 spec:
   selector:
     app: refresh-gameserver
   ports:
-    - protocol: TCP
+    - name: refresh-gameserver
       port: 10061
-      targetPort: 10061
-  type: ClusterIP
+      protocol: TCP
+    - name: monitor
+      protocol: TCP
+      port: 52323
+    - name: monitor-metrics
+      protocol: TCP
+      port: 52325
+  type: ClusterIP

kube/servicemonitor.yaml

@@ -0,0 +1,19 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: refresh-gameserver-monitor
+  namespace: monitoring
+  labels:
+    app: refresh-gameserver
+    release: kube-prometheus-stack
+spec:
+  endpoints:
+    - interval: 5s
+      port: monitor-metrics
+      path: /metrics
+  namespaceSelector:
+    matchNames:
+      - refresh
+  selector:
+    matchLabels:
+      app: refresh-gameserver