Add note that Usage Metering is unavailable in US1-FED (#2600)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2024-12-18 17:18:37.829361",
-            "spec_repo_commit": "8cb3faac"
+            "regenerated": "2024-12-18 19:23:44.640997",
+            "spec_repo_commit": "3f22290a"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2024-12-18 17:18:37.843992",
-            "spec_repo_commit": "8cb3faac"
+            "regenerated": "2024-12-18 19:23:44.656520",
+            "spec_repo_commit": "3f22290a"
         }
     }
 }

.generator/schemas/v2/openapi.yaml

@@ -32622,7 +32622,8 @@ paths:
         != null BEGIN\n  sleep(5 seconds)  # Avoid running into rate limit\n  response
         := GetMonthlyCostAttribution(start_month, end_month, next_record_id=cursor)\n
         \ cursor := response.metadata.pagination.next_record_id\nEND\n```\n\nThis
-        endpoint is only accessible for [parent-level organizations](https://docs.datadoghq.com/account_management/multi_organization/)."
+        endpoint is only accessible for [parent-level organizations](https://docs.datadoghq.com/account_management/multi_organization/).
+        This endpoint is not available in the Government (US1-FED) site."
       operationId: GetMonthlyCostAttribution
       parameters:
       - description: 'Datetime in ISO-8601 format, UTC, precise to month: `[YYYY-MM]`

src/main/java/com/datadog/api/client/v2/api/UsageMeteringApi.java

@@ -1826,7 +1826,7 @@ public CompletableFuture<MonthlyCostAttributionResponse> getMonthlyCostAttributi
    *
    * <p>This endpoint is only accessible for <a
    * href="https://docs.datadoghq.com/account_management/multi_organization/">parent-level
-   * organizations</a>.
+   * organizations</a>. This endpoint is not available in the Government (US1-FED) site.
    *
    * @param startMonth Datetime in ISO-8601 format, UTC, precise to month: <code>[YYYY-MM]</code>
    *     for cost beginning in this month. (required)