Aias00 opened a new issue, #1010:
URL: https://github.com/apache/rocketmq-dashboard/issues/1010
## Problem
`GET /api/namespaces` is publicly mapped by `NamespaceController`, but
`MetadataService.listNamespaces()` throws `UnsupportedOperationException("Not
implemented")`. The global exception handler turns this into an unstructured
HTTP 500 response.
The current web application does not call this endpoint, and this issue does
not propose restoring the previously deferred Namespace resource-management
model. The immediate problem is that an exposed API advertises a successful
list operation but deterministically fails as an internal error.
## Expected behavior
When the current metadata provider does not implement namespace discovery,
the endpoint should return a structured, capability-aware HTTP 501 response. It
must not manufacture namespace data or introduce a Namespace UI.
## Scope
Track 1 / Control Plane API reliability. This is intentionally limited to
error semantics for the existing endpoint.
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