# Netdata

EvoHub receives Netdata Cloud notifications through the **Webhook** integration. Warning and critical alerts open EvoHub alerts and clear when Netdata sends them as cleared. Node reachability notifications open an alert when a node is unreachable and resolve it when the node is back. Netdata's webhook integration needs a paid Netdata Cloud space.

## Set it up

:::steps
### Create the integration
In EvoHub, go to **On-Call → Integrations → + Add Integration**, choose **Netdata**, pick an **Escalation Policy** and click **Create Integration**. Copy the **Webhook URL**.
### Add the webhook in Netdata
In Netdata Cloud, open **Space settings → Alerts & Notifications → + Add configuration → Webhook**. Set **Webhook URL** to your webhook URL and leave authentication off — the key in the URL authenticates the call. Choose the rooms and notification types.
### Send a test
Click **Test**. In EvoHub, an **info** alert called "Netdata test notification received" appears. It pages nobody, is not posted to Slack and does not count toward usage; its description holds the verification token.
### Paste the token
Copy the token into **Verification → Token** in Netdata and save the configuration. Resolve the test alert.
:::

## What EvoHub reads

### Alert notifications

| EvoHub alert | Taken from |
| --- | --- |
| Title | "`alert` on `chart`", for example "disk_space_usage on disk_space./". |
| Description | `message`, followed by `info`. |
| Labels | `chart`, `context`, `family`, `class`, `space`, `rooms`, and `url` (the `alert_url`). |
| Fingerprint | The alert name and chart. |

| Netdata severity | EvoHub |
| --- | --- |
| critical | critical |
| warning | medium |
| clear | resolves the alert |

### Reachability notifications

A node becoming unreachable opens "`host` is unreachable" as **critical**. A notification with `status.reachable: true` resolves it.

## Resolve and deduplication

- `severity: clear` resolves the open alert with the same alert name and chart.
- A warning that becomes critical, or repeats while open, is recorded as **Retriggered** on the same alert.

## Related

- [Integrations overview](https://docs-dev.evohub.io/integrations-overview.md)
- [Escalation policies](https://docs-dev.evohub.io/escalation-policies.md)