Gitlab integration with Datadog

Hello Everyone,
I am new here , I am looking forward for some support from the forum.
I am trying to integrate Datadog with Gitlab. I followed this gitlab documentation and did group level configuration , in parallel as suggested by Datadog documentation we need to do agent configuration as well which is as below.

confd:
   gitlab.yaml: |-
      ad_identifiers:
        - gitlab
      init_config: {}
      instances:
        - {"gitlab_url":"http://gitlab.com/", "openmetrics_endpoint":"http://gitlab.com:10055/-/metrics"}
      logs:
      - source: gitlab
        service: gitlab

We are us gitlab SaaS, and do not have access to underlying server, not sure the open metrics_endpoint is right or not and if it is then why gitlab is not scraping the metric to Datadog.
I also looked into this Document where it mention that gitlab makes internal service metric available at the /-/metrics endpoint.

Any help would be much appretiated.