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@@ -51,7 +51,9 @@ Here you can specify the name of the alert rule and how often the scheduler shou
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### For
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-> This setting is available in Grafana 5.4 and above.
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+> **Important note regarding No Data:**
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+>
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+> Do not use `For` with the `If no data or all values are null` setting set to `No Data`. The triggering of `No Data` will trigger instantly and not take `For` into consideration. This may also result in that an OK notification not being sent if alert transitions from `No Data -> Pending -> OK`.
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If an alert rule has a configured `For` and the query violates the configured threshold it will first go from `OK` to `Pending`. Going from `OK` to `Pending` Grafana will not send any notifications. Once the alert rule has been firing for more than `For` duration, it will change to `Alerting` and send alert notifications.
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Marcus Efraimsson