mik-laj commented on pull request #9477:
URL: https://github.com/apache/airflow/pull/9477#issuecomment-650118840


   @VinayGb665 The content of the extra field depends on the implementation of 
the specific hook.
   https://airflow.readthedocs.io/en/latest/howto/connection/gcp.html
   
   For GCP, we have the following keys:
   
   > - extra__google_cloud_platform__project - Project Id
   > - extra__google_cloud_platform__key_path - Keyfile Path
   > - extra__google_cloud_platform__keyfile_dict - Keyfile JSON
   > - extra__google_cloud_platform__scope - Scopes
   > - extra__google_cloud_platform__num_retries - Number of Retries
   
   https://airflow.readthedocs.io/en/latest/howto/connection/gcp.html
   
   From a technical point of view, an extra is a JSON object with any keys and 
any values.


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