...

Since this is a new interface and opt-in behavior, no backward compatibility concerns are anticipated. 

Note that for the minimum broker version for using telemetry reporting is 3.7.  Using v. 3.7+ clients and Kafka Streams with pre-3.7 broker means there is no telemetry collection and the registerMetricsForSubscription  as a no-op method.  There is no action to be taken by the user in this case.

Test Plan

There will be unit and integration tests added to ensure correct behavior.

...