Qichao Chu created KAFKA-16127:
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             Summary: Reset corresponding verbosity configs when topic is 
deleted
                 Key: KAFKA-16127
                 URL: https://issues.apache.org/jira/browse/KAFKA-16127
             Project: Kafka
          Issue Type: Task
            Reporter: Qichao Chu


*{{metrics.verbosity}}* will be a new dynamic config introduced to control the 
verbosity(fan-out rate) of the metrics. It's a config with JSON format 
specifying the condition controlling fan-out of the metrics.

When the topic is deleted, the corresponding topic config should be reset to 
default value because:
 # If the topic is automatically recreated, the verbosity from the previous 
generation may cause too much/too little metrics to be emitted
 # Too many unused configurations may cause user error when configuring this 
field. The typical workflow would be getting the value first, then adding or 
modifying the config to reflect the latest requirement. If we don't delete 
unused entries, it could only grow instead of evolve.



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