DOCS-8200 Watchdog Insights Doc Update (#23622)

Co-authored-by: aliciascott <[email protected]>
Co-authored-by: hestonhoffman <[email protected]>

content/en/watchdog/insights.md

@@ -42,8 +42,9 @@ The Watchdog Insights carousel sits near the top of the following product pages:
     - [Processes Explorer][7]
     - [Serverless Explorer][8]
     - [Kubernetes Explorer][9]
-- [Real User Monitoring (RUM) Explorer][10]
-- [Error Tracking issue side panel][13]
+    - [Real User Monitoring (RUM) Explorer][10]
+    - [Synthetic Monitoring & Testing Explorer][15]
+    - [Error Tracking issue side panel][13]
 
 Expand the carousel for an overview. The highest priority insights (based on `Insight type`, `State`, `Status`, `Start time`, `Anomaly type`) appear on the left.
 
@@ -249,6 +250,23 @@ In the full side panel, you can see a timeseries graph about the performance met
 [1]: /real_user_monitoring/explorer/search/#facets
 [2]: /real_user_monitoring/browser/monitoring_page_performance/#event-timings-and-core-web-vitals
 [3]: /real_user_monitoring/browser/monitoring_page_performance/#monitoring-single-page-applications-spa
+{{% /tab %}}
+{{% tab "Synthetic Monitoring" %}}
+
+### Error outliers
+
+Error outliers in Synthetic Monitoring display unexpected behaviors and performance deviations. These anomalies provide insights into the reliability issues in your [Synthetic Browser Tests][101]. Identifying these error outliers helps you troubleshoot errors in failed test runs, enhancing debugging and reducing Mean Time To Resolution (MTTR).
+
+When reviewing failed test runs, you can see the number of error outliers on the failed test:
+
+{{< img src="watchdog/synthetics_watchdog_outlier.png" alt="An overview of a failed browser test run with test step details and the error message which was identified as an error outlier for a failing test step by Watchdog" style="width:100%;" >}}
+
+To view the error outlier message, click on the outlier. Then, on the test step side panel, click the **Errors & Warnings** tab.
+
+{{< img src="watchdog/outlier_step_error_2.png" alt="An error message which was identified as an error outlier for a failing test step by Watchdog" style="width:100%;" >}}
+
+[101]: /synthetics/browser_tests
+
 {{% /tab %}}
 {{% tab "Serverless" %}}
 
@@ -305,3 +323,5 @@ For Kubernetes Explorer, the Watchdog Insight carousel reflects [all the Kuberne
 [12]: https://app.datadoghq.com/watchdog
 [13]: https://app.datadoghq.com/rum/error-tracking
 [14]: /dashboards/graph_insights/watchdog_explains
+[15]: https://app.datadoghq.com/synthetics/explorer
+