Add documentation for Zookeeper client

execution/README.md

@@ -102,7 +102,15 @@ Other Kafka deployments, for example, using Strimzi, should work in a similar wa
 A permanently running pod used for Kafka configuration is started via:
 
 ```sh
-kubectl apply -f infrastructure/kafka/kafka-client.yaml 
+kubectl apply -f infrastructure/kafka/kafka-client.yaml
+```
+
+#### A Zookeeper Client Pod
+
+Also a permanently running pod for ZooKeeper access is started via:
+
+```sh
+kubectl apply -f infrastructure/zookeeper-client.yaml
 ```
 
 #### The Kafka Lag Exporter

execution/infrastructure/zookeeper-client.yaml

+apiVersion: v1
+kind: Pod
+metadata:
+  name: zookeeper-client
+spec:
+  containers:
+  - name: zookeeper-client
+    image: confluentinc/cp-zookeeper:5.4.0
+    command:
+      - sh
+      - -c
+      - "exec tail -f /dev/null"