[jira] [Created] (KAFKA-18735) the zk-related path `` is still existent in quota system, such as `ConfigEntity#name` and metrics tags

["Chia-Ping Tsai (Jira)" <ji...@apache.org>]

Chia-Ping Tsai created KAFKA-18735:
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             Summary: the zk-related path `<default>` is still existent in quota system, such as `ConfigEntity#name` and metrics tags
                 Key: KAFKA-18735
                 URL: https://issues.apache.org/jira/browse/KAFKA-18735
             Project: Kafka
          Issue Type: Improvement
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai


the `<default>` is a specific "flag" used by zk path to represent the "default" quota. We don't expose it on Admin as we use `null` to represent the default name [0], and in KAFKA-16411 we assumes `<default>` should be removed from 4.0 with the end of ZK mode [1]

However, the `<default>` is still used in two "public APIs"

1. ConfigEntity#name return <default> for default quotas. The docs say it return empty string, but that is incorrect. see [2]
2.  "client-id" -> "<default>" and "user" -> "<default>" are used in metrics tag [3]
 

[0] https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/quota/ClientQuotaEntity.java#L44
[1] https://github.com/apache/kafka/blob/trunk/server-common/src/main/java/org/apache/kafka/server/config/ZooKeeperInternals.java#L24
[2] https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/server/ClientQuotaManager.scala#L79
[3] https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/server/ClientQuotaManager.scala#L479



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