KIP-1297 — Role-Aware Metric Tags for NodeToControllerChannelManagerImpl

Discussion MetricsKRaft

Adds a role tag (broker, controller, or broker+controller) to the metric labels emitted by NodeToControllerChannelManagerImpl so that SelectorMetrics can be disambiguated by node role in KRaft mode. The component currently tags metrics only with broker-id, producing duplicate or misleading metrics on controller-only or combined nodes where brokerId is not meaningful.

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