GitHub user bobojobo added a comment to the discussion: Serialization of 
notifier inputs

For future ref:
I changed from 
    def pre(**kwargs):
        print("preparing...")

to 
    def pre(params):
        print("preparing...")


That made it work.

(I also upgraded to airflow 3.1.3, where I saw the same error occur for the new 
structlog)

GitHub link: 
https://github.com/apache/airflow/discussions/56475#discussioncomment-15095583

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