Istio can't use nacos as the mcp server

[whalecold]

Describe the bug The istio can't startup successfully when I use the nacos as it's mcp server because of the failure of readiness. I found the nacos don't sync the istio/networking/v1alpha3/serviceentries resource to istio.

Expected behavior Istiod can sync all resource and startup successfully.

Acutally behavior Lack of the istio/networking/v1alpha3/serviceentries resource.

How to Reproduce Steps to reproduce the behavior:

1. git clone https://github.com/nacos-group/nacos-k8s.git
2. performer ./quick-startup.sh
3. enable mcp server for nacos, add the key-value to environment variable

       - name: NACOS_ISTIO_MCP_SERVER_ENABLED
         value: "true"

4. install istio of 1.8.3 version
5. add the config to istio ConfigMap:

   
   data:
   mesh: |-
   defaultConfig:
     discoveryAddress: istiod.istio-system.svc:15012
     proxyMetadata:
       DNS_AGENT: ""
     tracing:
       zipkin:
         address: zipkin.istio-system:9411
   enablePrometheusMerge: true
   rootNamespace: istio-system
   trustDomain: cluster.local
   configSources:
   - address: nacos-headless.default.svc.cluster.local:18848
   meshNetworks: 'networks: {}'

6. restart the pod of istiod.

**Desktop (please complete the following information):**
 - OS: [kubernetes]
 - Version [nacos-server 2.0.0]
 - Module [istio]
 - SDK [e.g. original, spring-cloud-alibaba-nacos, dubbo]

**Additional context**
istio verison: 1.8.3

[lzp0412]

Istio 1.8 does not support mcp protocol anymore, it uses mcp over xds protocol. This will be released in the next version of nacos 2.0. Currently the code has been merged into the feature_support_grpc_core branch, you can pull it. How to run it? 1、nacos/console/src/main/resources/application.properties , add "nacos.istio.mcp.server.enabled=true" in this file. 2、run nacos/console/src/main/java/com/alibaba/nacos/Nacos.java

[whalecold]

Istio 1.8 does not support mcp protocol anymore, it uses mcp over xds protocol. This will be released in the next version of nacos 2.0. Currently the code has been merged into the feature_support_grpc_core branch, you can pull it. How to run it? 1、nacos/console/src/main/resources/application.properties , add "nacos.istio.mcp.server.enabled=true" in this file. 2、run nacos/console/src/main/java/com/alibaba/nacos/Nacos.java

The istio 1.9 does not support, the 1.8 version support mcp over xds protocol and mcp protocol in both.

[whalecold]

And i found the stream has been established in the log but lack the collection of istio/networking/v1alpha3/serviceentries .