I set logging to 2 in my site_config.json (I want to see some of the SQL queries being made and I see frappe.db.sql outputs on this level), but I don’t see any additional logging in either my frappe-bench/logs or on the stdout from bench.
To answer my own question, it’s 2.
I see now the framework is passing along the contents of the log buffers and dumping the lines into my browser’s JS console.