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---
stage: Monitor
group: Monitor
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`.
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