Add instructions about enabling Gitlab metrics (#6766)
Add instructions about enabling Gitlab metrics (#6766)

* Add instructions about enabling Gitlab metrics

* Add .
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core