Unable to depoly a vm with the default centos template on xenserver 8.4

### problem

The long description of your problem

### versions

ACS 4.22
Xenserver 8.4

### The steps to reproduce the bug

1. Have a cloudstack environment with xenserver 8.4 hypervisor

2. Deploy a vm with default centos template

CentOS 5.6(64-bit) no GUI (XenServer)
http://download.cloudstack.org/templates/builtin/centos56-x86_64.vhd.bz2

3. Deployment fails with the following exception

Logs

```
2026-08-05 07:28:21,240 DEBUG [c.c.h.x.r.w.x.CitrixStartCommandWrapper] (DirectAgent-71:[ctx-79a585c0]) (logid:5a107745) 1. The VM i-2-63-VM is in Starting state.
2026-08-05 07:28:21,242 WARN [c.c.h.x.r.w.x.CitrixStartCommandWrapper] (DirectAgent-71:[ctx-79a585c0]) (logid:5a107745) Catch Exception: class com.cloud.utils.exception.CloudRuntimeException due to com.cloud.utils.exception.CloudRuntimeException: Cannot find Template CentOS 7 on XenServer host com.cloud.utils.exception.CloudRuntimeException: Cannot find Template CentOS 7 on XenServer host
at com.cloud.hypervisor.xenserver.resource.CitrixResourceBase.createVmFromTemplate(CitrixResourceBase.java:1300)
at com.cloud.hypervisor.xenserver.resource.wrapper.xenbase.CitrixStartCommandWrapper.execute(CitrixStartCommandWrapper.java:93)
at com.cloud.hypervisor.xenserver.resource.wrapper.xenbase.CitrixStartCommandWrapper.execute(CitrixStartCommandWrapper.java:57)
at com.cloud.hypervisor.xenserver.resource.wrapper.xenbase.CitrixRequestWrapper.execute(CitrixRequestWrapper.java:122)
at com.cloud.hypervisor.xenserver.resource.CitrixResourceBase.executeRequest(CitrixResourceBase.java:1780)
at com.cloud.agent.manager.DirectAgentAttache$Task.runInContext(DirectAgentAttache.java:306)
at org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
at org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:840)

2026-08-05 07:28:21,242 WARN [c.c.h.x.r.Xenserver84Resource] (DirectAgent-71:[ctx-79a585c0]) (logid:5a107745) Unable to start i-2-63-VM due to com.cloud.utils.exception.CloudRuntimeException: Cannot find Template CentOS 7 on XenServer host
at com.cloud.hypervisor.xenserver.resource.CitrixResourceBase.createVmFromTemplate(CitrixResourceBase.java:1300)
at com.cloud.hypervisor.xenserver.resource.wrapper.xenbase.CitrixStartCommandWrapper.execute(CitrixStartCommandWrapper.java:93)
at com.cloud.hypervisor.xenserver.resource.wrapper.xenbase.CitrixStartCommandWrapper.execute(CitrixStartCommandWrapper.java:57)
at com.cloud.hypervisor.xenserver.resource.wrapper.xenbase.CitrixRequestWrapper.execute(CitrixRequestWrapper.java:122)
at com.cloud.hypervisor.xenserver.resource.CitrixResourceBase.executeRequest(CitrixResourceBase.java:1780)
at com.cloud.agent.manager.DirectAgentAttache$Task.runInContext(DirectAgentAttache.java:306)
at org.apache.cloudstack.managed.context.ManagedContextRunnable$1.run(ManagedContextRunnable.java:49)
at org.apache.cloudstack.managed.context.impl.DefaultManagedContext$1.call(DefaultManagedContext.java:56)
at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.callWithContext(DefaultManagedContext.java:103)
at org.apache.cloudstack.managed.context.impl.DefaultManagedContext.runWithContext(DefaultManagedContext.java:53)
at org.apache.cloudstack.managed.context.ManagedContextRunnable.run(ManagedContextRunnable.java:46)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:840)
```

4. Xenceter 8.4 says Centos 7 is deprecated

### What to do about it?

Cloudstack should map the correct guest os in case the host is xenserver 8.4

or go about replacing the templated with a newer version

https://github.com/apache/cloudstack/discussions/13797

Bắt đầu tại CitrixResourceBase.java:1300 và đường dẫn cảnh báo của Xenserver84Resource, sau đó theo dõi quá trình triển khai từ CitrixStartCommandWrapper.java. Tái hiện việc triển khai template CentOS mặc định trên XenServer 8.4 và kiểm tra cách hệ điều hành khách và template được chọn. Hoàn tất khi template CentOS được hỗ trợ triển khai thành công mà không gặp lỗi "Cannot find Template CentOS 7".

Do mô hình lập chỉ mục viết ra từ nội dung của issue.