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25 lines
946 B
Markdown
25 lines
946 B
Markdown
---
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id: internal
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title: /internal-backstage/prometheus
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---
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# Internal Backstage API
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`GET http://unleash.host.com/internal-backstage/prometheus`
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Unleash uses prometheus internally to collect metrics. These are available on the given url if the `serverMetrics` option is enabled (default=true).
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[Read more about Prometheus](https://prometheus.io/)
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## Annotations {#annotations}
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Unleash will automatically count all updates for all toggles under the metric name `feature_toggle_update_total`, and the toggle name is will be set as a label value. This information can be used to create annotations in grafana for everytime a feature toggle is changed.
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You can use this query in grafana to achieve this:
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```
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delta(feature_toggle_update_total{toggle="Demo"}[1m]) != bool 0
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```
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Another useful counter is the `feature_toggle_usage_total` which will give you the numbers for how many times a feature toggle has been evaluated to `active` or not.
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