import requests

url = "https://{FUSION HOST}/async-parsing/failed-datasource/{datasourceId}"

response = requests.get(url)

print(response.text)

[
  {
    "id": "<string>",
    "datasourceId": "<string>",
    "documentId": "<string>",
    "jobRunId": "<string>",
    "collectionId": "<string>",
    "pipelineId": "<string>",
    "connectorType": "<string>",
    "failures": 123,
    "contentType": "<string>",
    "metadata": {},
    "requestHeaders": {},
    "optionalContentType": "<string>"
  }
]