[jira] [Created] (KAFKA-16125) Add parser for the metrics.verbosity config

["Qichao Chu (Jira)" <ji...@apache.org>]

Qichao Chu created KAFKA-16125:
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             Summary: Add parser for the metrics.verbosity config
                 Key: KAFKA-16125
                 URL: https://issues.apache.org/jira/browse/KAFKA-16125
             Project: Kafka
          Issue Type: Task
            Reporter: Qichao Chu
            Assignee: 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.

The parser will have the following validation responsibilities:
 # Validate that the config conforms to JSON format.
 # Validate that the level field is configured correctly with a set level
 # Validate that the names field pattern is acceptable to {{java.util.regex-compatible}}
 # Validate that the filters field conforms to JSON map format
 # Validate that all the filter patterns are acceptable to {{java.util.regex-compatible}}
 # Validate that no other field exists in the config

After parsing and validating the config, the parser should:
 * Generate a config object which contains the level, names, and filter fields. There should exist a default verbosity level too.
 * Inside the object, the predicates should also be generated to allow fast querying of the rules
 * Overwrite/update the existing predicates if the config is updated

The config object should:
 * Determine the verbosity level supplied with the topic name and the metrics name
 * If not defined, fall back to the default config level



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