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Take AlterConfig as an example to understand the change changes we are making.

Change AlterConfig Request Routing

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To effectively monitor the request forwarding status, we would add two metrics: request-forwarding-to-controller-rate and request-fowarding-to-controller-count to visualize the forwarding progress. 

In the long term after bridge release, we need to could potentially perform some incompatible changes to the Raft Quorum. To monitor the old client connections to better capture the timing for a major version bump, we shall also expose a metric called old-client-connections-count beyond KIP-511. This metric will record those clients whose version is older than the first KIP-511 supported client, as they have no self identity to propose. 

Compatibility, Deprecation, and Migration Plan

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