Modo-me opened a new pull request, #3685:
URL: https://github.com/apache/dubbo-go/pull/3685

   
   ### Description
   Related to #3356 PR2
   
   暴露了metadata source, storage type, revision, and cache hit/miss在元数据链路里的可观测性
   ### Changes
   - 为revision链路在customizer计算点、registry发布点和消费点增添了相关的日志:
   `registry/servicediscovery/customizer/service_revision_customizer.go`
   `registry/servicediscovery/service_instances_changed_listener_impl.go`
   `registry/servicediscovery/service_discovery_registry.go`
   
   - 增加了cache hit/mis时的日志和指标MetadataCache
   `registry/servicediscovery/service_instances_changed_listener_impl.go`
   - 增加了消费侧的日志和指标MetadataFetch,并暴露metadata source, storage type
   `registry/servicediscovery/service_instances_changed_listener_impl.go`
   
   ### Checklist
   - [x] I confirm the target branch is `develop`
   - [x] I have run `make fmt` to format my code
   - [x] I have run `make test` to run local tests
   - [x] I have added tests that prove my fix is effective or that my feature 
works
   


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