[Bug] dubbo 3.3.2 can not set extra metadata

[luger1990]

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Apache Dubbo Component

Java SDK (apache/dubbo)

Dubbo Version

dubbo:
  application:
    name: ${spring.application.name}-dubbo
    id: ${spring.application.name}-dubbo
    register-mode: instance
    logger: slf4j
    owner: shen
    organization: vn
    environment: @dubbo.environment@
    shutwait: 60000
    meta-data:
      hostname4: ${HOSTNAME:localhost}
    parameters:
      hostname5: ${HOSTNAME:localhost}
  protocol:
    id: dubbo
    name: dubbo
    port: -1
    serialization: hessian2
  registry:
    address: nacos://@nacos.server@
    meta-data:
      hostname3: ${HOSTNAME:localhost}
    parameters:
      hostname2: ${HOSTNAME:localhost}
  config-center:
    address: nacos://@nacos.server@
  metadata-report:
    address: nacos://@nacos.server@
    parameters:
      hostname1: ${HOSTNAME:localhost}
  scan:
    base-packages: com.xxx
  consumer:
    check: false
  provider:
    threads: 500
    delay: 10000
  metrics:
    protocol: prometheus

I user the code above try to set extra metadata 'hostname', but it dose not work. So how to set extra metadata

Steps to reproduce this issue

use the dubbo config above

What you expected to happen

I want to set extra metadata

Anything else

No response

Are you willing to submit a pull request to fix on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct

[AlbumenJ]

Why do you want to do it?

[luger1990]

Why do you want to do it?

eg: I want to set hostname into metadata, so I can know which server the service runs on. spring cloud can support this feature, so I hope dubbo can support too.