init alerting

Author: forstisabella

src/connections/reverse-etl/index.md

@@ -159,18 +159,23 @@ To reset a sync:
 #### Replays
 You can choose to replay syncs. To replay a specific sync, contact [[email protected]](mailto:[email protected]). Keep in mind that triggering a replay resyncs all records for a given sync.
 
-#### Email alerts
-You can opt in to receive email alerts regarding notifications for Reverse ETL. 
+#### Alerting
+You can opt in to receive email, Slack, and in-app alerts about Reverse ETL sync failures and partial successes. 
 
-To subscribe to email alerts: 
+To subscribe to alerts: 
 1. Navigate to **Settings > User Preferences**. 
 2. Select **Reverse ETL** in the **Activity Notifications** section.
-3. Click the toggle on for the notifications you want to receive. You can choose from:
-
-    Notification | Details
-    ------ | -------
-    Reverse ETL Sync Failed | Set toggle on to receive notification when your Reverse ETL sync fails. 
-    Reverse ETL Sync Partial Success | Set toggle on to receive notification when your Reverse ETL sync is partially successful. 
+3. Click the Reverse ETL sync status that you'd like to receive notifications for. You can select one or more of the following sync statuses:
+    - **Reverse ETL sync failed**: Receive a notification when your Reverse ETL sync fails.
+    - **Reverse ETL sync partial success**: Receive a notification when your Reverse ETL sync is partially successful.
+4. Select one or more of the following alert options: 
+    - **Enable email notifications**: Enter an email address or alias that should receive alerts.
+    - **Enable Slack notifications**: Enter a Webhook URL and Slack channel name.
+    - **Enable in-app notifications**: Select this option to see an in-app notification.
+5. Click **Create alert**.
+
+> info "View email addresses that are signed up to receive alerts"
+> If you opted to receive notifications by email, you can click **View active email addresses** to see the email addresses that are currently signed up to receive notifications. 
 
 ### Edit your model