[GitHub] [pulsar] rcastagnet opened a new issue #4337: Duplicate metrics Prometheus

[GitBox <gi...@apache.org>]

rcastagnet opened a new issue #4337: Duplicate metrics Prometheus
URL: https://github.com/apache/pulsar/issues/4337
 
 
   **Describe the bug**
   The default metrics stay present even though there is an other metrics with more information.
   Prometheus only processes this default metric.
   
   **To Reproduce**
   * Produce and consumer on your cluster
   * Do a curl on metrics url : 
   ```
   curl -s server01:8080/metrics/ | grep -e pulsar_consumers_count
   ```
   * The result :
   ```
   pulsar_consumers_count{cluster="pulsar_bdx"} 0 1558518241858
   pulsar_consumers_count{cluster="pulsar_bdx",namespace="ns/global",topic="persistent://ns/global/queue"} 1.0 1558518241859
   ```
   * Next, in prometheus you find only :
   ```
   pulsar_consumers_count{cluster="pulsar_bdx",instance="server01:8080",job="Pulsar-broker-exporter"} 0
   ```
   
   **Expected behavior**
   
   * In Prometheus, you should find :
   ```
   pulsar_consumers_count{cluster="pulsar_bdx",instance="server01:8080",job="Pulsar-broker-exporter",namespace="ns/global",topic="persistent://ns/global/queue1"} 1
   ```
   
   **Additional context**
   
   In my test, I solved this problem by commenting on the next line of the file "pulsar-broker/src/main/java/org/apache/pulsar/broker/stats/prometheus/NamespaceStatsAggregator.java" :
   ```
   // printDefaultBrokerStats(stream, cluster);
   ```
   An other solution should be the next line (I didn't try yet) :
   ```
   if (pulsar.getBrokerService().getMultiLayerTopicMap().isEmpty()) {
       printDefaultBrokerStats(stream, cluster);
   }
   ```
   
   
   Why do these metrics remain constantly instead of being overrided by new values?

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