优化mtr探测策略

tongran-modules/tongran-mtragent/src/main/java/com/tongran/mtragent/service/impl/RmMtrPolicyConfigServiceImpl.java

@@ -290,6 +290,12 @@ public class RmMtrPolicyConfigServiceImpl implements IRmMtrPolicyConfigService
                     serverIds.add(id.trim());
                 }
             }
+            // 如果列表为空，直接返回空列表，避免不必要的数据库查询
+            if (serverIds.isEmpty()) {
+                return serverIds;
+            }
+            // 过滤离线的服务器
+            serverIds = rmMtrPolicyConfigMapper.getOnlineServerId(serverIds);
         }
         return serverIds;
     }