Integrate GitLab with Splunk

Hi,

Following documenation from your site, there is information about log which keeps details events in JSON format, and this is a format which allows integration with Splunk.

Could you help me understand what I can to do to integrate GitLab CE with Splunk, please?
On which version following file has been added to GitLab: production_json.log and what are recommended steps to setup integration (for example: setup webhook, setup something else, etc)

Please advice.
Best regards.