Add automatic prometheus monitoring to the cockroachdb example

cockroachdb/cockroachdb-petset.yaml

@@ -2,7 +2,12 @@ apiVersion: v1
 kind: Service
 metadata:
   annotations:
+    # Make sure DNS is resolvable during initialization.
     service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
+    # Enable automatic monitoring of all instances when Prometheus is running in the cluster.
+    prometheus.io/scrape: "true"
+    prometheus.io/path: "_status/vars"
+    prometheus.io/port: "8080"
   name: cockroachdb
   labels:
     app: cockroachdb

cockroachdb/minikube.sh

@@ -54,6 +54,8 @@ kind: PersistentVolumeClaim
 apiVersion: v1
 metadata:
   name: datadir-cockroachdb-${i}
+  labels:
+    app: cockroachdb
 spec:
   accessModes:
     - ReadWriteOnce