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

[Anshul-creator]

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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-spring exhibit flaky behavior when execution order or JVM internal iteration order changes. These flakes were consistently reproduced using:

./mvnw -q -pl dubbo-config/dubbo-config-spring\
  edu.illinois:nondex-maven-plugin:2.2.1:nondex \
  -DnondexRuns=50

The reasons 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

What you expected to happen

All tests should pass deterministically and be independent of JVM iteration order or test execution order.

Anything else

I have opened several PR's for solving the issue. The PR structure follows the PR's I had opened for #15795 which have all been accepted. The PR's opened for this issue are as follows:

• Fix: Stabilize dubbo-config-spring tests by Disabling Metrics Initialization and Ensuring Test Isolation  #15819
• Fix: Stabilize dubbo-config-spring reference-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15828
• Fix: Stabilize dubbo-config-spring issues-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15833
• Fix: Stabilize dubbo-config-spring beans-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15834
• Fix: Stabilize dubbo-config-spring context-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15835
• Fix: Stabilize more dubbo-config-spring reference-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15840
• Fix: Stabilize dubbo-config-spring propertyconfigurer-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15841
• Fix: Stabilize dubbo-config-spring remaining reference and schema-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15844
• Fix: Stabilize dubbo-config-spring boot-related tests by Disabling Metrics Initialization and Ensuring Test Isolation #15845
• Fix: Stabilize remaining outlier dubbo-config-spring tests by Disabling Metrics Initialization and Ensuring Test Isolation #15846

Are you willing to submit a pull request to fix on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct

[Anshul-creator]

@RainYuY @zrlw please review the issue and corresponding PR's