Elixir currently uses a global setting for filtering out sasl reports. Now earlier this year I started work on porting nerves shoehorn to :logger from the deprecated :error_logger and it needs access to those sasl logs, but it doesn't really need the default logger handler handling sasl logs (or forcing users to enable that).
I'm wondering if elixir's logger filters should rather be opt in (filters on the default handler only, documented as options for custom handlers) vs primary filters, which apply to all handlers without "opt out".