Add note about Prometheus retention policy

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Olivér Falvai 2022-03-29 22:26:29 +02:00 committed by GitHub
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@ -25,6 +25,8 @@ matrix_grafana_default_admin_password: "some_strong_password_chosen_by_you"
By default, a [Grafana](https://grafana.com/) web user-interface will be available at `https://stats.<your-domain>`.
The retention policy of Prometheus metrics is [15 days by default](https://prometheus.io/docs/prometheus/latest/storage/#operational-aspects). Older data gets deleted automatically.
## What does it do?