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# Node filter
The node filter allows you to quickly filter the nodes visualized in a War Room's views. It appears on all views, except on single-node dashboards.
Inside the filter, the nodes get categorized into three groups:
| Group | Description |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Live | Nodes that are currently online, collecting and streaming metrics to Cloud. Live nodes display raised [Alert](https://github.com/netdata/netdata/blob/master/docs/monitor/view-active-alerts.md) counters, [Machine Learning](https://github.com/netdata/netdata/blob/master/ml/README.md) availability, and [Functions](https://github.com/netdata/netdata/blob/master/docs/cloud/netdata-functions.md) availability |
| Stale | Nodes that are offline and not streaming metrics to Cloud. Only historical data can be presented from a parent node. For these nodes you can only see their ML status, as they are not online to provide more information |
| Offline | Nodes that are offline, not streaming metrics to Cloud and not available in any parent node. Offline nodes are automatically deleted after 30 days and can also be deleted manually. |
By using the search bar, you can narrow down to specific nodes based on their name.
When you select one or more nodes, the total selected number will appear in the **Nodes** bar on the **Selected** field.
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