chore: import upstream snapshot with attribution

docs/en/integrations/cloudmonitoring/prebuilt-configs/cloud-sql-for-sql-server-observability.md

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+---
+title: "Cloud SQL for SQL Server Observability"
+type: docs
+description: "Details of the Cloud SQL for SQL Server Observability prebuilt configuration."
+---
+
+## Cloud SQL for SQL Server Observability
+
+*   `--prebuilt` value: `cloud-sql-mssql-observability`
+*   **Permissions:**
+    *   **Monitoring Viewer** (`roles/monitoring.viewer`) is required on the
+        project to view monitoring data.
+*   **Tools:**
+    *   `get_system_metrics`: Fetches system level cloud monitoring data
+        (timeseries metrics) for a SQL Server instance using a PromQL query.