Enable Prometheus metrics in Zookeeper too

Package did not exist on Debian 10/11

roles/pvc/tasks/frr/main.yml

@@ -15,7 +15,7 @@
   register: apt_res
   retries: 5
   until: apt_res is success
-  when: enable_prometheus_exporters is defined and enable_prometheus_exporters
+  when: enable_prometheus_exporters is defined and enable_prometheus_exporters and debian_version|int >= 12
 
 - name: install frr configuration
   template:

roles/pvc/templates/zookeeper/zoo.cfg.j2

@@ -19,6 +19,10 @@ maxClientCnxns=200
 autopurge.snapRetainCount=3
 autopurge.purgeInterval=1
 
+# Enable Prometheus metrics
+metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
+metricsProvider.httpPort=9181
+
 # Listen on port 2181 on the cluster IP
 clientPort=2181
 clientPortAddress={% for node in pvc_nodes if node.hostname == this_node %}{{ node.cluster_ip }}{% endfor %}