developing my Elixir + Phoenix with these settings

config/dev.exs

config :logger,
  backends: [{LoggerFileBackend, :info}]

   config :logger, :info,
   path: "log/push_app2_test.log",
   level: :info

the logger in phoenix channel is set to

defmodule PushApp2Web.XYZChannel do
  use Phoenix.Channel, log_join: :debug, log_handle_in: false

Now while testing elixir app with tsung where it creates 50K plus connections I am getting these messages in log.

`13:45:05.939 [warn] Logger has stopped discarding messages

13:45:05.967 [warn] Logger has 1001 messages in its queue, which is above :discard_threshold. Messages will be discarded until the message queue goes back to 75% of the threshold size
13:45:05.968 [warn] Logger has stopped discarding messages`

I also tried to log message with zero arity function as:

`Logger.debug(fn -> "the meaning of life" end)`

I thought all debug messages are not logged. What is happening here and how to fix this??