gaoran10 opened a new pull request, #19062:
URL: https://github.com/apache/pulsar/pull/19062

   ### Motivation
   
   Most of the tests are all based on the class `TestRetrySupport`, which 
supports resetting the broken test environments, the `ProxyServiceStarter` will 
register metrics in the default collector registry if we restart the 
`ProxyServiceStarter`, it will throw the exception like this.
   
   ```
   java.lang.IllegalArgumentException: Failed to register Collector of type 
Gauge: jvm_memory_direct_bytes_used is already in use by another Collector of 
type Gauge
   ```
   
   ### Modifications
   
   Clean up the default collector registry when closing the ProxyServiceStarter.
   
   ### Verifying this change
   
   This change is already covered by existing tests.
   
   ### Does this pull request potentially affect one of the following parts:
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   *If the box was checked, please highlight the changes*
   
   - [ ] Dependencies (add or upgrade a dependency)
   - [ ] The public API
   - [ ] The schema
   - [ ] The default values of configurations
   - [ ] The threading model
   - [ ] The binary protocol
   - [ ] The REST endpoints
   - [ ] The admin CLI options
   - [ ] The metrics
   - [ ] Anything that affects deployment
   
   ### Documentation
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [ ] `doc` <!-- Your PR contains doc changes. Please attach the local 
preview screenshots (run `sh start.sh` at `pulsar/site2/website`) to your PR 
description, or else your PR might not get merged. -->
   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update 
later -->
   - [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->
   
   ### Matching PR in forked repository
   
   PR in forked repository: <!-- ENTER URL HERE -->
   
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