# Node filter The node filter allows you to quickly filter the nodes visualized in a 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](/docs/dashboards-and-charts/alerts-tab.md) counters, [Machine Learning](/src/ml/README.md) availability, and [Functions](/docs/top-monitoring-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. 