chore: import upstream snapshot with attribution

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

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+---
+title: "Cloud SQL for PostgreSQL Observability"
+type: docs
+description: "Details of the Cloud SQL for PostgreSQL Observability prebuilt configuration."
+---
+
+## Cloud SQL for PostgreSQL Observability
+
+*   `--prebuilt` value: `cloud-sql-postgres-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 Postgres instance using a PromQL query.
+    *   `get_query_metrics`: Fetches query level cloud monitoring data
+        (timeseries metrics) for queries running in Postgres instance using a
+        PromQL query.