KIP-1338 — Structured MDC Context for Kafka Logging

Discussion BrokerClientConnect

Populates the SLF4J Mapped Diagnostic Context with standardized fields (kafka.node.id, kafka.topic, kafka.partition, kafka.client.id, kafka.component) across broker, controller, and client components, and ships ready-to-use JSON Log4j2 configuration files. KIP-653 made JsonTemplateLayout available in Kafka 4.0, but only Kafka Connect sets MDC (via KIP-449), so structured logging emits null for every context field and identifying attributes stay trapped in message-string prefixes that log aggregators can only extract with custom regex.

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