feat(alerts): Restore duplciate alert rule docs

src/docs/product/alerts/create-alerts/index.mdx

@@ -20,3 +20,18 @@ To create alerts:
 1. On the alert configuration page, set the conditions of the alert:
     - [Issue Alert Configuration](/product/alerts/create-alerts/issue-alert-config/)
     - [Metric Alert Configuration](/product/alerts/create-alerts/metric-alert-config/)
+
+
+## Duplicate Alerts
+
+<Note>
+
+  This feature is available only if you're in the Early Adopter program. Features available to Early Adopters are still in-progress and may have bugs. We recognize the irony.
+
+  If you’re interested in being an Early Adopter, you can turn your organization’s Early Adopter status on/off in General Settings. This will affect all users in your organization and can be turned back off just as easily.
+
+</Note>
+
+You can also create an alert by duplicating an existing issue or metric alert rule. To do so, navigate to **Alerts** and click "Duplicate" in the context menu (under "Actions") on the row with the alert rule you want to copy:
+
+![Expanded alert list row context menu](alert-list-row-menu.png)