title: Prometheus zookeeper monitoring
body: <p>i want to move zookeeper to being monitored by prometheus . 
  i deployed jmx-exporter (sscaling/jmx-prometheus-exporter:0.1.0)</p>
  
  <p>and got most of the metrics but some are missing , for example zookeeper.approximate_data_size and parnew metrics of the GarbageCollector</p>
  
  <p>for example:
  i get this par new metrics from the logstash with the same jmx exporter:
  java_lang_GarbageCollector_LastGcInfo_memoryUsageAfterGc_used{name="ParNew",key="Par Survivor Space",} </p>
  
  <p>but in the zookeeper i get only copy metrics:
  java_lang_GarbageCollector_LastGcInfo_memoryUsageAfterGc_used{name="Copy",key="Metaspace",} 1.4809288E7</p>