[jira] [Created] (KAFKA-2588) ReplicaManager partitionCount metric should actually be replicaCount

["Grant Henke (JIRA)" <ji...@apache.org>]

Grant Henke created KAFKA-2588:
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             Summary: ReplicaManager partitionCount metric should actually be replicaCount
                 Key: KAFKA-2588
                 URL: https://issues.apache.org/jira/browse/KAFKA-2588
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.8.2.1
            Reporter: Grant Henke
            Assignee: Grant Henke


The metrics "partitionCount" in the ReplicaManager actually represents the count of replicas. 

As an example if I have a cluster with 1 topic with 1 partitions and a replication factor of 3. The metric (aggregated) would show a value of 3. 

There is a metric called "LeaderCount" that actually represents the "partitionCount". In my example above the metric (aggregated) would show a value of 1. 

We do need to consider compatibility of consuming systems. I think the most simple change would be to:
- Adjust the "partitionCount" metric to be the same value as "LeaderCount"
- Add a "replicaCount" metric which contains the values "partitionCount" does today
- Leave "LeaderCount" in for compatibility

Documentation will need to be updated as well. 



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