代码修改后的版本，全部提交

TencentCloud/Mariadb/V20170312/Models/DescribeDBPerformanceRequest.cs

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+/*
+ * Copyright (c) 2018 THL A29 Limited, a Tencent company. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+namespace TencentCloud.Mariadb.V20170312.Models
+{
+    using Newtonsoft.Json;
+    using System.Collections.Generic;
+    using TencentCloud.Common;
+
+    public class DescribeDBPerformanceRequest : AbstractModel
+    {
+        
+        /// <summary>
+        /// 实例 ID，形如：tdsql-ow728lmc。
+        /// </summary>
+        [JsonProperty("InstanceId")]
+        public string InstanceId{ get; set; }
+
+        /// <summary>
+        /// 开始日期，格式yyyy-mm-dd
+        /// </summary>
+        [JsonProperty("StartTime")]
+        public string StartTime{ get; set; }
+
+        /// <summary>
+        /// 结束日期，格式yyyy-mm-dd
+        /// </summary>
+        [JsonProperty("EndTime")]
+        public string EndTime{ get; set; }
+
+        /// <summary>
+        /// 拉取的指标名，支持的值为：long_query,select_total,update_total,insert_total,delete_total,mem_hit_rate,disk_iops,conn_active,is_master_switched,slave_delay
+        /// </summary>
+        [JsonProperty("MetricName")]
+        public string MetricName{ get; set; }
+
+
+        /// <summary>
+        /// For internal usage only. DO NOT USE IT.
+        /// </summary>
+        internal override void ToMap(Dictionary<string, string> map, string prefix)
+        {
+            this.SetParamSimple(map, prefix + "InstanceId", this.InstanceId);
+            this.SetParamSimple(map, prefix + "StartTime", this.StartTime);
+            this.SetParamSimple(map, prefix + "EndTime", this.EndTime);
+            this.SetParamSimple(map, prefix + "MetricName", this.MetricName);
+        }
+    }
+}
+