Grafana Alerting is enabled by default for new OSS installations. For older installations, it is still an [opt-in]({{< relref "../alerting/migrating-alerts/opt-in" >}}) feature.
Legacy dashboard alerts are deprecated and will be removed in Grafana 9. We encourage you to migrate to [Grafana Alerting]({{< relref "../alerting/migrating-alerts" >}}) for all existing installations.
- Notification channel - How the alert is delivered. When the conditions of an alert rule are met, the Grafana notifies the channels configured for that alert.