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Docs: adds not on stale alerts (#67887)

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* adds stale alert note

* Update docs/sources/alerting/alerting-rules/create-grafana-managed-rule.md

Co-authored-by: Alexander Weaver <weaver.alex.d@gmail.com>

* alex feedback

---------

Co-authored-by: Alexander Weaver <weaver.alex.d@gmail.com>
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brendamuir 2023-05-08 09:20:57 +02:00 committed by GitHub
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docs/sources/alerting/alerting-rules/create-grafana-managed-rule.md
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@ -111,3 +111,9 @@ If your evaluation returns an error, you can set the state on your alert rule to
| Error | Creates an alert instance `DatasourceError` with the name and UID of the alert rule, and UID of the datasource that returned no data as labels. |
| Alerting | Sets alert rule state to `Alerting`. The alert rule waits until the time set in the **For** field has finished before firing. |
| Ok | Sets alert rule state to `Normal`. |
### Resolve stale alert instances
An alert instance is considered stale if its dimension or series has disappeared from the query results entirely for two evaluation intervals.
Stale alert instances that are in the **Alerting**/**NoData**/**Error** states are automatically marked as **Resolved** and the grafana_state_reason annotation is added to the alert instance with the reason **MissingSeries**.