I have an umbrella application which has logger configuration in the root config.exs file: config :logger, compile_time_purge_level: :debug, backends: [ {LoggerFileBackend, :backends_log} ] config :logger, :backends_log, path: "path/to/awesome.log", level: :debug, metadata: :all A…

Did the :logger application started? That may be the source of the problem, as kernel.logger is updated only when Logger application starts. Just beware, that logger configuration is not applied during compilation, it is only runtime thing.

Elixir Programming Language Forum

Elixir OTP 24 doesn't apply custom Logger backend

Questions & Help Questions

rokku3kpvc December 22, 2021, 12:00pm 3

Yes, it did

:application.ensure_all_started(:logger)
=> {:ok, []}