feat(metadata): add renew and GC policy for app-level metadata

[eye-gu]

Description

Fixes #3355

Checklist

• I confirm the target branch is develop
• Code has passed local testing
• I have added tests that prove my fix is effective or that my feature works

[codecov-commenter]

Codecov Report

❌ Patch coverage is 63.11111% with 83 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.07%. Comparing base (60d1c2a) to head (f8beceb).
⚠️ Report is 827 commits behind head on develop.

Files with missing lines	Patch %	Lines
...try/servicediscovery/service_discovery_registry.go	60.82%	27 Missing and 11 partials ⚠️
metadata/report/zookeeper/report.go	62.85%	12 Missing and 1 partial ⚠️
metadata/info/metadata_info.go	0.00%	10 Missing ⚠️
metadata/report/nacos/report.go	80.85%	7 Missing and 2 partials ⚠️
metadata/report/etcd/report.go	76.00%	6 Missing ⚠️
metadata/report/report.go	0.00%	5 Missing ⚠️
metadata/report_instance.go	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3371      +/-   ##
===========================================
+ Coverage    46.76%   53.07%   +6.30%     
===========================================
  Files          295      494     +199     
  Lines        17172    38172   +21000     
===========================================
+ Hits          8031    20258   +12227     
- Misses        8287    16265    +7978     
- Partials       854     1649     +795     

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[Copilot]

Pull request overview

This PR adds a lifecycle policy for application-level metadata in remote metadata centers by introducing (1) a daily “renew” republish and (2) a GC routine to delete stale revisions, along with new MetadataReport APIs to support listing and unpublishing revisions across Nacos/Etcd/Zookeeper.

Changes:

• Introduces daily app-metadata renew + stale-revision GC in serviceDiscoveryRegistry, gated by URL params.
• Extends report.MetadataReport with UnPublishAppMetadata and ListAppRevisions, and implements them for Nacos/Etcd/Zookeeper.
• Adds lastUpdatedTime to app metadata payloads and adds/updates tests for renew/GC and report backends.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
registry/servicediscovery/service_discovery_registry.go	Adds daily renew timer and GC logic that deletes stale app-metadata revisions.
registry/servicediscovery/service_discovery_registry_test.go	Adds unit tests for GC behavior, renew behavior, timer stop, and delay calculation.
metadata/report/zookeeper/report.go	Adds zk client abstraction; implements publish update-on-exists, unpublish, and list revisions.
metadata/report/zookeeper/report_test.go	Adds mock-based tests for publish/get/update, unpublish, and list revisions.
metadata/report/report.go	Extends the metadata report interface with revision listing + unpublish and adds helper to parse lastUpdatedTime.
metadata/report/nacos/report.go	Implements unpublish + list revisions for Nacos metadata configs.
metadata/report/nacos/report_test.go	Adds tests for Nacos unpublish and list revisions behaviors.
metadata/report/etcd/report.go	Fixes etcd app-metadata key path; adds unpublish + list revisions for etcd.
metadata/report/etcd/report_test.go	Reworks etcd metadata-report tests with a lightweight in-memory mock.
metadata/report_instance.go	Delegates the new metadata-report methods through DelegateMetadataReport.
metadata/report_instance_test.go	Adds delegation tests for the new interface methods.
metadata/mapping/metadata/service_name_mapping_test.go	Updates mock metadata report to satisfy the extended interface.
metadata/info/metadata_info.go	Adds LastUpdatedTime field to app metadata payload.
common/constant/key.go	Adds configuration keys for metadata renew-on-startup and GC settings.

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[Alanxtl]

lgtm

[Alanxtl]

1. 当前测试覆盖率偏低，建议至少补一两个 timer/GC 核心分支测试，尤其是 stale revision 被清理、alive revision 被保留这两个路径。
2. doRenewAppMetadata 里依赖 MetadataInfo.Snapshot()，合并 feat(metadata): add concurrency safety for application-level metadata state (#3353) #3367 后要确认 Snapshot 是带锁/深拷贝语义，避免 renew 时读写 metadata 产生 race

[Alanxtl]

合并顺序

#3360、#3362 先合，低耦合。
#3367 作为并发安全底座。
#3369 合入，建立 registryId/report/cache 作用域。
#3370 rebase 到 #3367 + #3369 之后，特别检查 revision 计算不要绕开锁。
#3371 再合，接受 MetadataReport 接口扩展，并补确认 Snapshot() 与 #3367 锁语义一致。
#3373 最后 rebase，因为它和 #3371 同改 report backends；语义不重复，但文件冲突概率高。

[AlexStocks]

@eye-gu fix file confliction

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
18.3% Duplication on New Code

See analysis details on SonarQube Cloud

[eye-gu]

@eye-gu fix file confliction

已经rebase develop

@Alanxtl

添加了测试