## NoData Handling

- Handling of missing data is important to differentiate between no active alert or data stopped coming. For example, if host is supposed to run continuously but it went down. In this case, alert is needed. Using this setting, you can generate NoData alert.
- If generate NoData is not enabled, then alert state (Critical, Major, Minor, or Normal) will not change.
- If generate NoData is enabled, then alert state will change to NoData
- Notification will be sent if enabled in the observer like other alert states.
- Notification will be sent if enabled in the alert rule like other alert states.
- NoData alerts auto-resolve after 24 hours. In some cases, like metric is deleted or alert engine is restarted, auto resolve can happen before 24 hours.