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---
stage: Monitor
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group: Respond
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments
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---
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# Sample Prometheus data Rake task **(FREE SELF)**
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The Rake task runs Prometheus queries for each of the metrics of a specific environment
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for a series of time intervals to now:
- 30 minutes
- 3 hours
- 8 hours
- 24 hours
- 72 hours
- 7 days
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The results of each query are stored under a `sample_metrics` directory as a YAML
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file named by the metric's `identifier` . When the environmental variable `USE_SAMPLE_METRICS`
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is set, the Prometheus API query is re-routed to `Projects::Environments::SampleMetricsController` ,
which loads the appropriate data set if it's present in the `sample_metrics` directory.
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The Rake task requires an ID from an environment with an available Prometheus installation.
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## Example
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The following example demonstrates how to run the Rake task:
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```shell
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bundle exec rake gitlab:generate_sample_prometheus_data[21]
```
