Exception type: UnexpectedResponseError
Message: Server returned unexpected status code: 502 (https://debusine.trinitydesktop.net/api/1.0/artifact-relation/)

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/debusine/tasks/_task.py", line 878, in _execute
    self.upload_artifacts(
    ~~~~~~~~~~~~~~~~~~~~~^
        execute_directory, execution_result=execution_result
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3/dist-packages/debusine/tasks/sbuild.py", line 736, in upload_artifacts
    self._create_remote_binary_packages_relations(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        remote_build_log,
        ^^^^^^^^^^^^^^^^^
    ...<2 lines>...
        remote_signing_input,
        ^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3/dist-packages/debusine/tasks/sbuild.py", line 666, in _create_remote_binary_packages_relations
    self.debusine.relation_create(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        remote_signing_input.id,
        ^^^^^^^^^^^^^^^^^^^^^^^^
        remote_binary_upload.id,
        ^^^^^^^^^^^^^^^^^^^^^^^^
        RelationType.RELATES_TO,
        ^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3/dist-packages/debusine/client/debusine.py", line 537, in relation_create
    return self._debusine_http_client.post(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        "/artifact-relation/",
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<4 lines>...
        expected_statuses=[requests.codes.ok, requests.codes.created],
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3/dist-packages/debusine/client/debusine_http_client.py", line 99, in post
    return self._api_request(
           ~~~~~~~~~~~~~~~~~^
        "POST",
        ^^^^^^^
    ...<3 lines>...
        expected_statuses=expected_statuses,
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3/dist-packages/debusine/client/debusine_http_client.py", line 319, in _api_request
    raise exceptions.UnexpectedResponseError(
    ...<2 lines>...
    )
debusine.client.exceptions.UnexpectedResponseError: Server returned unexpected status code: 502 (https://debusine.trinitydesktop.net/api/1.0/artifact-relation/)