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All Kafka component register AppInfo  metrics to track the application start time or commit-id etc. These metrics are useful for monitoring and debugging. However, the AppInfo doesn't provide client-id, which is an important information for custom metrics reporter. 

As the The AppInfoParser   class registers a JMX MBean with the provided client-id, but when it adds metrics to the Metrics registry, the client-id is not included. This KIP aims to add the client-id as a tag.

Public Interfaces

Currently MetricName:

• [name=start-time-ms, group=app-info, description=Metric indicating start-time-ms, tags={}]
• [name=commit-id, group=app-info, description=Metric indicating commit-id, tags={}]
• [name=version, group=app-info, description=Metric indicating version, tags={}]

New MetricName:

• [name=start-time-ms, group=app-info, description=Metric indicating start-time-ms, tags={client-id=<component-id>}]
• [name=commit-id, group=app-info, description=Metric indicating commit-id, tags={client-id=<component-id>}]
• [name=version, group=app-info, description=Metric indicating version, tags={client-id=<component-id>}]org.apache.kafka.common.utils.AppInfoParser

Proposed Changes

1) The new MBean will include a new tag, client-id

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