awelless opened a new pull request, #11670:
URL: https://github.com/apache/nifi/pull/11670

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   # Summary
   
   [NIFI-16310](https://issues.apache.org/jira/browse/NIFI-16310)
   
   Controller Services created by `migrateProperties` method were always 
recreated during a versioned process group upgrade,  causing the trigger of 
`@OnRemoved` hook and loss of component state.
   Now migration-created services are matched with their counterparts in a 
versioned process group. If match is successful, a local controller service 
assumes a versioned id without being recreated.
   
   If no match happens, a controller services is kept unversioned, but not 
removed.
   
   ### Verification
   
   - Synchronizer unit tests.
   - System tests.
   
   ### Additional changes
   
   `FileSystemFlowRegistryClient` which is used in system tests was moved into 
a separate NAR, to be available before and after NAR swap.
   
   ## Suggested review order
   
   - `MigrationCreatedControllerServiceVersioningIT` and its dependencies to 
see the relevant use cases.
   - `StandardVersionedComponentSynchronizer` for actual implementation.
   - `StandardVersionedComponentSynchronizerTest` to see the desired behavior 
for edge cases.
   
   # Tracking
   
   Please complete the following tracking steps prior to pull request creation.
   
   ### Issue Tracking
   
   - [Apache NiFi Jira](https://issues.apache.org/jira/browse/NIFI) issue 
created
   
   ### Pull Request Tracking
   
   - Pull Request title starts with Apache NiFi Jira issue number, such as 
`NIFI-00000`
   - Pull Request commit message starts with Apache NiFi Jira issue number, as 
such `NIFI-00000`
   - Pull request contains [commits 
signed](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits)
 with a registered key indicating `Verified` status
   
   ### Pull Request Formatting
   
   - Pull Request based on current revision of the `main` branch
   - Pull Request refers to a feature branch with one commit containing changes
   
   # Verification
   
   Please indicate the verification steps performed prior to pull request 
creation.
   
   ### Build
   
   - [x] Build completed using `./mvnw clean install -P contrib-check`
     - [x] JDK 21
     - [ ] JDK 25
   
   ### Licensing
   
   - [ ] New dependencies are compatible with the [Apache License 
2.0](https://apache.org/licenses/LICENSE-2.0) according to the [License 
Policy](https://www.apache.org/legal/resolved.html)
   - [ ] New dependencies are documented in applicable `LICENSE` and `NOTICE` 
files
   
   ### Documentation
   
   - [ ] Documentation formatting appears as expected in rendered files
   


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