[I] [Bug] Metrics Initialization Causing Flaky Tests in `dubbo-config/dubbo-config-spring` [dubbo]

["Anshul-creator (via GitHub)" <gi...@apache.org>]

Anshul-creator opened a new issue, #15795:
URL: https://github.com/apache/dubbo/issues/15795

   ### Pre-check
   
   - [x] I am sure that all the content I provide is in English.
   
   
   ### Search before asking
   
   - [x] I had searched in the [issues](https://github.com/apache/dubbo/issues?q=is%3Aissue) and found no similar issues.
   
   
   ### Apache Dubbo Component
   
   Java SDK (apache/dubbo)
   
   ### Dubbo Version
   
   Dubbo 3.3.7
   JDK 17/21
   
   ### Steps to reproduce this issue
   
   Several tests across `dubbo-config/dubbo-config-api` exhibit flaky behavior when execution order or JVM internal iteration order changes. These flakes were consistently reproduced using:
   
   ```bash 
   ./mvnw -q -pl dubbo-config/dubbo-config-api \
     edu.illinois:nondex-maven-plugin:2.2.1:nondex \
     -DnondexRuns=20
   ```
   
   ### What you expected to happen
   
   The reason for the flakiness are below:
   
   **Micrometer metrics subsystem initialization**
   - `CompositeMeterRegistry` uses mutable global structures
   - `IdentityHashMap` iteration order varies
   - Metrics are initialized implicitly during `DubboBootstrap.start()`
   
   **DubboBootstrap global state not reset across tests**
   - ApplicationModel / FrameworkModel carry over state
   - Reference cache survives between tests
   - System properties affect bootstrap behavior if not cleared
   
   ### Anything else
   
   I have opened several PR's for solving the issue. I opened one PR per test file. The PRs below have been accepted:
   
   - https://github.com/apache/dubbo/pull/15778
   - https://github.com/apache/dubbo/pull/15782
   - https://github.com/apache/dubbo/pull/15785
   
   The rest of the PR's mentioned below are open for review and follow the same method to solving the flakiness used in the PRs that were accepted above:
   
   - https://github.com/apache/dubbo/pull/15787 
   - https://github.com/apache/dubbo/pull/15789 
   - https://github.com/apache/dubbo/pull/15790 
   - https://github.com/apache/dubbo/pull/15791 
   - https://github.com/apache/dubbo/pull/15792 
   - https://github.com/apache/dubbo/pull/15793 
   - https://github.com/apache/dubbo/pull/15794
   
   ### Are you willing to submit a pull request to fix on your own?
   
   - [x] Yes I am willing to submit a pull request on my own!
   
   ### Code of Conduct
   
   - [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)
   


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