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Update docs/configuring-playbook-prometheus-grafana.md: create a section for the Node Exporter

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Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>
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Suguru Hirahara 2025-02-09 22:44:22 +09:00
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docs/configuring-playbook-prometheus-grafana.md
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@ -21,18 +21,24 @@ Prometheus is an open-source systems monitoring and alerting toolkit. To enable
```yaml
prometheus_enabled: true
# Uncomment to enable Node Exporter.
# prometheus_node_exporter_enabled: true
```
Name | Description
-----|----------
`prometheus_enabled`|[Prometheus](https://prometheus.io) is a time series database. It holds all the data we're going to talk about.
`prometheus_node_exporter_enabled`|[Node Exporter](https://prometheus.io/docs/guides/node-exporter/) is an addon of sorts to Prometheus that collects generic system information such as CPU, memory, filesystem, and even system temperatures.
**Note**: 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.
### Enable metrics and graphs for generic system information (optional)
You can enable the [Node Exporter](https://prometheus.io/docs/guides/node-exporter/), an addon of sorts to Prometheus that collects generic system information such as CPU, memory, filesystem, and even system temperatures.
To enable it, add the following configuration to your `vars.yml` file:
```yaml
prometheus_node_exporter_enabled: true
```
### Enable metrics and graphs for Postgres (optional)
Expanding on the metrics exposed by the Synapse exporter and the Node exporter, the playbook can also install and configure the [PostgreSQL Server Exporter](https://github.com/prometheus-community/postgres_exporter) that exposes more detailed information about what's happening on your Postgres database.