云效API接口报 503 错误，是否是因为 variables 参数过大导致的？

云效API接口 UpdateVariableGroup 报 503 错误，是否是因为 variables 参数过大导致，有什么参数可以控制提交成功吗？
{
"date": "Mon, 25 Sep 2023 02:32:40 GMT",
"content-type": "application/json;charset=utf-8",
"content-length": "286",
"connection": "keep-alive",
"keep-alive": "timeout=25",
"access-control-allow-origin": "",
"access-control-expose-headers": "",
"x-acs-request-id": "21D00F8D-1937-5645-8750-99D293E5FB40",
"x-acs-trace-id": "461c0e9ba43172618d35309920e9516a"
}
"RequestId": "59AEB868-4127-5DBC-A941-782BE88A147A",
"Message": "The request has failed due to a temporary failure of the server.",
"Recommend": "https://api.aliyun.com/troubleshoot?q=ServiceUnavailable&product=devops",
"HostId": "devops.cn-hangzhou.aliyuncs.com",
"Code": "ServiceUnavailable"
}