install blackbox exporter and improve hc

contrib/blackbox-exporter.yaml

@@ -0,0 +1,35 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: blackbox-exporter
+  namespace: mon
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: blackbox-exporter
+  template:
+    metadata:
+      labels:
+        app: blackbox-exporter
+    spec:
+      containers:
+      - image: prom/blackbox-exporter:master
+        name: blackbox-exporter
+        ports:
+        - containerPort: 9115
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: blackbox-exporter
+  namespace: mon
+spec:
+  ports:
+  - name: http
+    port: 9115
+    protocol: TCP
+    targetPort: 9115
+  selector:
+    app: blackbox-exporter
+  type: ClusterIP

contrib/healthchecks-cronjob.yaml

@@ -8,6 +8,7 @@ spec:
   concurrencyPolicy: Forbid
   successfulJobsHistoryLimit: 1
   failedJobsHistoryLimit: 1
+  startingDeadlineSeconds: 200
   jobTemplate:
     spec:
       template: