Add Prom+Grafana monitoring stack

manifests/monitoring/prometheus/deployment.yaml

@@ -0,0 +1,52 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: prometheus
+  namespace: gitops-system
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: prometheus
+  template:
+    metadata:
+      labels:
+        app: prometheus
+      annotations:
+        appmesh.k8s.aws/sidecarInjectorWebhook: disabled
+        sidecar.istio.io/inject: "false"
+    spec:
+      serviceAccountName: prometheus
+      containers:
+          - name: prometheus
+            image: prom/prometheus:v2.20.0
+            imagePullPolicy: IfNotPresent
+            args:
+              - '--storage.tsdb.retention=2h'
+              - '--config.file=/etc/prometheus/prometheus.yml'
+            ports:
+              - containerPort: 9090
+                name: http
+            livenessProbe:
+              httpGet:
+                path: /-/healthy
+                port: 9090
+            readinessProbe:
+              httpGet:
+                path: /-/ready
+                port: 9090
+            resources:
+              requests:
+                cpu: 10m
+                memory: 128Mi
+            volumeMounts:
+              - name: config-volume
+                mountPath: /etc/prometheus
+              - name: data-volume
+                mountPath: /prometheus/data
+      volumes:
+        - name: config-volume
+          configMap:
+            name: prometheus
+        - name: data-volume
+          emptyDir: {}