another question about Airflow - how does authentication work? If I follow https://datahubproject.io/docs/lineage/airflow/#using-datahubs-airflow-lineage-plugin-new do I need some sort of DataHub authentication token stored in Airflow?

Datahub backend api is not auth protected right now so airflow will make the post request to the Datahub api endpoint . In future, it could enforce the token based auth, based on its doc

If you have Metadata Service Authentication enabled, you will need to supply the token, looks like the documentation from this thread got removed: https://datahubspace.slack.com/archives/CV2UVAPPG/p1660781713054069