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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 ```yaml
prometheus_enabled: true prometheus_enabled: true
# Uncomment to enable Node Exporter.
# prometheus_node_exporter_enabled: true
``` ```
Name | Description 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_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. **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) ### 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. 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.