KIP-1315 — Split Connector Listing and Expanded Views in the Connect REST API

Discussion Connect

Splits the Connect `GET /connectors` endpoint in two: the existing URL always returns a JSON array of connector names, while a new `GET /connectors-details` returns the expanded map, with `expand` on the old URL deprecated (WARN-logged) for one major release then ignored. Today the same endpoint returns either an array or a map depending on the `expand` query parameter, an unstable schema that breaks OpenAPI code generation and strongly typed clients.

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