Sinatra outputs weird access logs ever though they’re disabled

Having weird issues running sinatra based web server inside dockers.

:set logging, false

a run from console doesn’t show any logs

from docked I see these:

[2019-09-12 23:36:51] INFO  WEBrick 1.3.1
[2019-09-12 23:36:51] INFO  ruby 2.3.7 (2018-03-28) [x86_64-linux-musl]
== Sinatra (v2.0.1) has taken the stage on 8081 for production with backup from WEBrick
[2019-09-12 23:36:51] INFO  WEBrick::HTTPServer#start: pid=1 port=8081 - - [12/Sep/2019:23:36:53 UTC] "GET /status HTTP/1.1" 200 20
- -> /api/status

Pretty much everything, even redirecting logs to a file

web_server = do
  set :environment, :production
  set :public_folder, 'public'
  set :bind, ''
  set :port, '8081'
  set :logging, false

Source: StackOverflow