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Prometheus support (#450)

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Co-authored-by: nils måsén <nils@piksel.se>
Co-authored-by: MihailITPlace <ya.halo-halo@yandex.ru>
Co-authored-by: Sebastiaan Tammer <sebastiaantammer@gmail.com>
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> **⚠️ Experimental feature**
>
> This feature was added in v1.0.4 and is still considered experimental.
> If you notice any strange behavior, please raise a ticket in the repository issues.
Metrics can be used to track how Watchtower behaves over time.
To use this feature, you have to set an [API token](arguments.md#http-api-token) and [enable the metrics API](arguments.md#http-api-metrics),
as well as creating a port mapping for your container for port `8080`.
## Available Metrics
| Name | Type | Description |
| ------------------------------- | ------- | --------------------------------------------------------------------------- |
| `watchtower_containers_scanned` | Gauge | Number of containers scanned for changes by watchtower during the last scan |
| `watchtower_containers_updated` | Gauge | Number of containers updated by watchtower during the last scan |
| `watchtower_containers_failed` | Gauge | Number of containers where update failed during the last scan |
| `watchtower_scans_total` | Counter | Number of scans since the watchtower started |
| `watchtower_scans_skipped` | Counter | Number of skipped scans since watchtower started |
## Demo
The repository contains a demo with prometheus and grafana, available through `docker-compose.yml`. This demo
is preconfigured with a dashboard, which will look something like this:
![grafana metrics](assets/grafana-dashboard.png)