Empty log files on a dockerizer gitlab

We have a gitlab docker container installed, where recenty the load was high.
Trying to investigate, we discovered that some log files were’nt populated :

-rw-r–r-- 1 git git 0 Apr 2 00:54 auth.log
-rw-r–r-- 1 git git 0 Apr 2 00:54 exceptions_json.log
-rw-r–r-- 1 git git 0 Apr 2 00:54 git_json.log
-rw-r–r-- 1 git git 0 Apr 2 00:54 githost.log

As you can see there are still rotated every day, but i can’t find oni the docs or the gitlab.rb the reason why git_json.log is empty. and i want to trace the push, pull, merge request, so i think this is the file i must have populated.

We’re running :

GitLab 12.9.1
GitLab Shell 12.0.0
GitLab Workhorse v8.25.1
GitLab API v4
Ruby 2.6.5p114
Rails 6.0.2
PostgreSQL 10.12

Can someont help me ?