Docs alerting doc updates (#42262)

* Replaced "Grafana 8 alerting" with "Grafana alerting". Added support matrix for Grafana alerting.

* Few more changes and added deprecation notice to legacy alerting landing page.

* Added more content from Yuri's PR.

* Ran prettier.

* Added code review changes.

* One more change.

* Fixed linked texts.
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achatterjee-grafana
2021-12-01 17:43:44 -05:00
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# Legacy Grafana alerts
Out of the box, Grafana still supports legacy dashboard alerts. If you are using version 8.0 or later, you can [opt-in]({{< relref "../unified-alerting/opt-in.md" >}}) to use Grafana 8 alerts. See [What's New with Grafana 8 alerting]({{< relref "../unified-alerting/difference-old-new.md" >}}) for more information.
Grafana alerting is enabled by default for new OSS installations. For older installations, it is still an [opt-in]({{< relref "../unified-alerting/opt-in.md" >}}) feature.
Legacy alerts have two main components:
> **Note**: Legacy dashboard alerts is deprecated and will be removed in a future release. We encourage you to migrate to [Grafana alerting]({{< relref "../unified-alerting/_index.md" >}}) for all existing installations.
Legacy dashboard alerts have two main components:
- Alert rule - When the alert is triggered. Alert rules are defined by one or more conditions that are regularly evaluated by Grafana.
- 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.