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 62.22222% with 85 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.77%. Comparing base (60d1c2a) to head (28773a8).
⚠️ Report is 816 commits behind head on develop.

Files with missing lines	Patch %	Lines
...try/servicediscovery/service_discovery_registry.go	58.76%	28 Missing and 12 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%   52.77%   +6.00%     
===========================================
  Files          295      493     +198     
  Lines        17172    38089   +20917     
===========================================
+ Hits          8031    20101   +12070     
- Misses        8287    16360    +8073     
- Partials       854     1628     +774     

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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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[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
14.8% Duplication on New Code

See analysis details on SonarQube Cloud