Enables metrics export to Prometheus, but they look very uninteresting.

The selected config is from the jmx_exporter examples.

Author: solsson

README.md

@@ -86,4 +86,6 @@ Is the metrics system up and running?
 ```
 kubectl logs -c metrics kafka-0
 kubectl exec -c broker kafka-0 -- /bin/sh -c 'apk add --no-cache curl && curl http://localhost:5556/metrics'
+kubectl logs -c metrics zoo-0
+kubectl exec -c zookeeper zoo-0 -- /bin/sh -c 'apk add --no-cache curl && curl http://localhost:5556/metrics'
 ```

zookeeper/50zoo.yml

@@ -10,11 +10,27 @@ spec:
     metadata:
       labels:
         app: zookeeper
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "5556"
     spec:
       terminationGracePeriodSeconds: 10
       containers:
+      - name: metrics
+        image: solsson/kafka-prometheus-jmx-exporter@sha256:1f7c96c287a2dbec1d909cd8f96c0656310239b55a9a90d7fd12c81f384f1f7d
+        command:
+        - "java"
+        - "-jar"
+        - "jmx_prometheus_httpserver.jar"
+        - "5556"
+        - example_configs/zookeeper.yaml
+        ports:
+        - containerPort: 5556
       - name: zookeeper
         image: solsson/kafka:0.11.0.0-rc2@sha256:c1316e0131f4ec83bc645ca2141e4fda94e0d28f4fb5f836e15e37a5e054bdf1
+        env:
+        - name: JMX_PORT
+          value: "5555"
         command:
         - sh
         - -c