Synthetics CI test API returns 502 error when called with metadata object

[spr0ut]

Describe the bug
The synthetics api for running tests triggered from ci with metadata included produces a 502 error.
HTTP response body: {"errors": ["'pipeline' should be object"]}

With the metadata removed, the synthetics test is triggers successfully but without the metadata present, it's impossible to tell which branch/commit triggered the test.

To Reproduce
Tested with curl:

curl -X POST \
-H 'Content-Type: application/json' \
-H "DD-API-KEY: ${DD_API_KEY}" \
-H "DD-APPLICATION-KEY: ${DD_APP_KEY}" \
-d '{
    "tests": [
        {
            "public_id": "{A_VALID_TEST_ID}"
        }
    ],
    "metadata": {
        "git": {
            "branch": "test"
        },
        "ci": {
            "pipeline": {},
            "provider": {
                "name": "azdo"
            }
        }
    }
}' "https://api.datadoghq.com/api/v1/synthetics/tests/trigger/ci"

Also tested with python client using the example in the docs from https://datadoghq.dev/datadog-api-client-python/v1/SyntheticsApi/#trigger_ci_tests.
This is simplified by removing everything else not needed, keeping the metadata.

import os
from dateutil.parser import parse as dateutil_parser
from datadog_api_client.v1 import ApiClient, ApiException, Configuration
from datadog_api_client.v1.api import synthetics_api
from datadog_api_client.v1.models import *
from pprint import pprint
# See configuration.py for a list of all supported configuration parameters.
configuration = Configuration()

# Enter a context with an instance of the API client
with ApiClient(configuration) as api_client:
# Create an instance of the API class
    api_instance = synthetics_api.SyntheticsApi(api_client)
    body = SyntheticsCITestBody(
        tests=[
            SyntheticsCITest(
                metadata=SyntheticsCITestMetadata(
                    ci=SyntheticsCITestMetadataCi(
                        pipeline="pipeline_example",
                        provider="provider_example",
                    ),
                    git=SyntheticsCITestMetadataGit(
                        branch="branch_example",
                        commit_sha="commit_sha_example",
                    ),
                ),
                public_id="A_VALID_TEST_ID",
            ),
        ],
    ) # SyntheticsCITestBody | Details of the test to trigger.

# example passing only required values which don't have defaults set
try:
# Trigger tests from CI/CD pipelines
    api_response = api_instance.trigger_ci_tests(body)
    print(api_response)
except ApiException as e:
    print("Exception when calling SyntheticsApi->trigger_ci_tests: %s\n" % e)

Expected behavior
The synthetic test is triggered, and is displayed in datadog with the supplied metadata (branch, pipeline, commit etc.)

Environment and Versions (please complete the following information):
datadogpy v0.42.0

[github-actions]

Thanks for your contribution!

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[spr0ut]

Not stale. Waiting for response on the original repo.

[spr0ut]

Looks like this was resolved with DataDog/datadog-api-client-python#610.