--- stage: Monitor group: Respond info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments --- # Puma exporter **(FREE SELF)** You can use the [Puma exporter](https://github.com/sapcc/puma-exporter) to measure various Puma metrics. To enable the Puma exporter: 1. [Enable Prometheus](index.md#configuring-prometheus). 1. Edit `/etc/gitlab/gitlab.rb` to add (or find and uncomment) the following lines. Make sure `puma['exporter_enabled']` is set to `true`: ```ruby puma['exporter_enabled'] = true puma['exporter_address'] = "127.0.0.1" puma['exporter_port'] = 8083 ``` 1. Save the file and [reconfigure GitLab](../../restart_gitlab.md#omnibus-gitlab-reconfigure) for the changes to take effect. Prometheus begins collecting performance data from the Puma exporter exposed at `localhost:8083`. For more information on using Puma with GitLab, see [Puma](../../operations/puma.md).