Git pull/push timings with gitlab-monitor

Hello everyone,
I would like to monitor my gitlab docker container with the built in gitlab-monitor and prometheus which is running in another container. I’m particularly interessted in
“git pull/push timings – git_pull_time_milliseconds, git_push_time_milliseconds”
as mentioned here: https://gitlab.com/gitlab-org/gitlab-monitor

gitlab-monitor is up and running after I enabled it in gitlab.rb. I can also verify that I get values from gitlab-monitor. But the git pull/push timings are somehow missing. I dont really understand ruby code but I can see something interesting in git.rb https://gitlab.com/gitlab-org/gitlab-monitor/blob/master/lib/gitlab_monitor/git.rb

class GitProber
  def initialize(opts, metrics: PrometheusMetrics.new)
    @metrics = metrics
    @labels = opts[:labels] || {}
    @git = Git.new(opts[:source])
  end

  def probe_pull
    @metrics.add "git_pull_time_milliseconds", (@git.pull.time * 1000).to_i, **@labels
    self
  end

  def probe_push
    @metrics.add "git_push_time_milliseconds", (@git.push.time * 1000).to_i, **@labels
    self
  end

  def write_to(target)
    target.write(@metrics.to_s)
  end
end

and in the gitlab-monitor.yml example here: https://gitlab.com/gitlab-org/gitlab-monitor/blob/master/config/gitlab-monitor.yml.example

# Probes config
probes:
  # Each key corresponds to an endpoint, so here metrics are available at http://localhost:9168/git.
  # The server will search for a prober using the format `KeyProber`, so here it will be `GitProber`.
  # If there's no prober matching the format above, `class_name` key should be provided (see `git_process` below).
  git:
    # Methods to call on the prober
    methods:
      - probe_pull
      - probe_push
    # Options to pass to the prober class initializer
    opts:
      source: /home/git/repo

  git_process: &git_process
    class_name: GitProcessProber # `class_name` is redundant here
    methods:
    - probe_git
    opts:
      quantiles: true

In my gitlab gitlab-monitor.yml this part

  # Each key corresponds to an endpoint, so here metrics are available at http://localhost:9168/git.
  # The server will search for a prober using the format `KeyProber`, so here it will be `GitProber`.
  # If there's no prober matching the format above, `class_name` key should be provided (see `git_process` below).
  git:
    # Methods to call on the prober
    methods:
      - probe_pull
      - probe_push
    # Options to pass to the prober class initializer
    opts:
      source: /home/git/repo

is missing. And when I try to add this part it gets deleted everytime I start all the containers with docker-compose on my local machine. I dont know if I even have to add this part here and if thats really the criticals part why I dont get these values but this is as far as I came.

Here is the Gitlab part in the docker-compose.yml file

  gitlab:
    image: 'gitlab/gitlab-ce:latest'
    restart: always
    hostname: '0.0.0.0'
    environment:
      GITLAB_OMNIBUS_CONFIG: |
        external_url 'https://0.0.0.0'
    ports:
      - "55550:22"
      - "55551:80"
      - "55552:443"
      - "55553:9168"
    volumes:
      - '/srv/gitlab/config:/etc/gitlab'
      - '/srv/gitlab/logs:/var/log/gitlab'
      - '/srv/gitlab/data:/var/opt/gitlab'