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According to the schema, the job metadata should be able to contain values of any kind:

            Optional("metadata"): {str: object},

(in lava_common/schemas/__init__.py)

However, when sending a value that is either a list or a dictionary the validation fails. For example:

metadata:
  api_config:
    name: staging.kernelci.org
    url: https://staging.kernelci.org:9000
    version: latest
  node_id: 645372a98fec6b4207361e03

raises the following validation error:

Invalid definition: expected str for dictionary value @ data['metadata']['api_config']

I've tried this with a small schema locally but couldn't reproduce the problem:

def main():
    schema = voluptuous.Schema({
        voluptuous.Required('name'): str,
        voluptuous.Optional('metadata'): {str: object},
    })
    data = {
        'name': 'Hello',
        'metadata': {
            'foo': 'bar',
            'a': {'x': 1, 'y': 3}
        },
    }
    val = schema(data)
    print(val)

which prints:

{'name': 'Hello', 'metadata': {'foo': 'bar', 'a': {'x': 1, 'y': 3}}}

So it seems like something is interfering with the plain voluptuous validation. The validation error shown via the web UI was also hit when trying to submit a job directly using the REST API, so it doesn't seem to be a web UI problem.