Merge pull request #31 from Yolean/metrics-via-jmx

Add metrics exporter for Prometheus

Author: solsson

50kafka.yml

@@ -10,11 +10,21 @@ spec:
     metadata:
       labels:
         app: kafka
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "5556"
     spec:
       terminationGracePeriodSeconds: 10
       containers:
+      - name: metrics
+        image: solsson/kafka-prometheus-jmx-exporter@sha256:1f7c96c287a2dbec1d909cd8f96c0656310239b55a9a90d7fd12c81f384f1f7d
+        ports:
+        - containerPort: 5556
       - name: broker
         image: solsson/kafka:0.11.0.0-rc2@sha256:c1316e0131f4ec83bc645ca2141e4fda94e0d28f4fb5f836e15e37a5e054bdf1
+        env:
+        - name: JMX_PORT
+          value: "5555"
         ports:
         - containerPort: 9092
         command:

README.md

@@ -78,3 +78,11 @@ Testing and retesting... delete the namespace. PVs are outside namespaces so del
 kubectl delete namespace kafka
 rm -R ./data/ && kubectl -n kafka delete pv datadir-kafka-0 datadir-kafka-1 datadir-kafka-2
 ```
+
+## Metrics, Prometheus style
+
+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'
+```