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

In the long term after bridge release, we need to 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 `oldold-client-connections-count` 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. 

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