...

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. 

...

For users currently relying on the AppInfoMBean metric name without client-id tag, it will remain available until Kafka 5.0. New users are encouraged to use the new AppInfoMBeanmetric name, which includes the client-id tag. This deprecation will be documented in upgrade.html.

In Kafka 5.0, the deprecated AppInfoMBean will be removed.following metric name will be deprecated 

• [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={}]

Test Plan

change unit test or Integration test to verify the new method.

...