Remove old manifests and replace with jsonnet build

examples/example-app/prometheus-frontend.yaml

@@ -0,0 +1,25 @@
+apiVersion: monitoring.coreos.com/v1
+kind: Prometheus
+metadata:
+  name: frontend
+  namespace: default
+  labels:
+    prometheus: frontend
+spec:
+  serviceAccountName: prometheus-frontend
+  version: v1.7.1
+  serviceMonitorSelector:
+    matchLabels:
+      tier: frontend
+  resources:
+    requests:
+      # 2Gi is default, but won't schedule if you don't have a node with >2Gi
+      # memory. Modify based on your target and time-series count for
+      # production use. This value is mainly meant for demonstration/testing
+      # purposes.
+      memory: 400Mi
+  alerting:
+    alertmanagers:
+    - namespace: monitoring
+      name: alertmanager-main
+      port: web