[PR] Use containsOnce for metadata e2e expected files [skywalking]

["wu-sheng (via GitHub)" <gi...@apache.org>]

wu-sheng opened a new pull request, #13815:
URL: https://github.com/apache/skywalking/pull/13815

   ### Use containsOnce for stricter metadata verification in e2e tests
   
   Migrate outer-level `contains` to `containsOnce` in 101 expected files:
   - **57 service.yml** — exact service names and IDs
   - **15 instance.yml** — known service instances
   - **5 endpoint.yml** — exact endpoint names
   - **24 topology files** — aggregated nodes and calls (no duplicates)
   
   `containsOnce` uses backtracking for optimal 1:1 assignment between expected and actual entries, ensuring each actual item matches exactly one expected entry. This is more precise than greedy `contains` for metadata where we know exactly which entries should exist.
   
   Inner nested `contains` (`.layers`, `.tags`, etc.) are left unchanged.
   
   **Verified locally** with the locally-built infra-e2e binary against mock data for service, instance, and topology patterns.
   
   - [ ] Update the [`CHANGES` log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).


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Re: [PR] Use containsOnce for metadata e2e expected files [skywalking]

["wu-sheng (via GitHub)" <gi...@apache.org>]

wu-sheng merged PR #13815:
URL: https://github.com/apache/skywalking/pull/13815


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