KIP-301 — Schema Inferencing for JsonConverter

Discussion Connect

KIP-301 adds schema inference to `JsonConverter` in Kafka Connect, allowing it to automatically derive a Connect schema from arbitrary JSON payloads when `schemas.enable=false`. Without schema inference, `JsonConverter` with `schemas.enable=true` requires the specific `{schema, payload}` envelope format and rejects plain JSON, while `schemas.enable=false` produces schemaless `Struct` objects that downstream SMTs and converters cannot inspect structurally.

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