Add option to send webserver audit logging to stdout

[ewierschke]

Description

While we've discovered that webserver audit logging (actions taken within the webserver, cli etc) appears to be written to the log table of the database, we have a need to have these logs written to stdout of the container running the webserver.
https://github.com/apache/airflow/blob/master/airflow/www/decorators.py#L33-L62
https://github.com/apache/airflow/blob/master/airflow/models/log.py

Use case / motivation

Was hoping an option could be added to enable the same log table entries to be written to stdout to enable capture and centralization of all logs.

[boring-cyborg[bot]]

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[GuidoTournois]

As far as I could see, there are two ways you could reach your goal.

1. Configure access log by gunicorn. This can be done by updating access_logfile in the airflow configuration file, airflow.cfg. This however, does probably not give you the freedom you are looking for.

2. A better option would be to add a new logger for the web server in DEFAULT_LOGGING_CONFIG (e.g. airflow.webserver) and retrieve this logger in the action_logging decorator. That way, Airflow users can use the proposed way for setting up custom logging configurations as described here:
   https://airflow.apache.org/docs/apache-airflow/stable/logging-monitoring/logging-tasks.html

I am happy to work on option 2, let's see if that is something you could use.