# GitLab monitor exporter >**Note:** Available since [Omnibus GitLab 8.17][1132]. For installations from source you'll have to install and configure it yourself. The [GitLab monitor exporter] allows you to measure various GitLab metrics. To enable the GitLab monitor exporter: 1. [Enable Prometheus](index.md#configuring-prometheus) 1. Edit `/etc/gitlab/gitlab.rb` 1. Find and uncomment the following line, making sure it's set to `true`: ```ruby gitlab_monitor_exporter['enable'] = true ``` 1. Save the file and [reconfigure GitLab][reconfigure] for the changes to take effect Prometheus will now automatically begin collecting performance data from the GitLab monitor exporter exposed under `localhost:9168`. [← Back to the main Prometheus page](index.md) [1132]: https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1132 [GitLab monitor exporter]: https://gitlab.com/gitlab-org/gitlab-monitor [prometheus]: https://prometheus.io [reconfigure]: ../../restart_gitlab.md#omnibus-gitlab-reconfigure