[PR] KAFKA-16381: add lock for KafkaMetric config getter [kafka]

[via GitHub]

johnnychhsu opened a new pull request, #15550:
URL: https://github.com/apache/kafka/pull/15550

   ## Context
   In KafkaMetirc.java, the config getter is 
   
   ```
   @Override
   public MetricName metricName()
   { return this.metricName; }
   ```
   
   and there is a setter 
   
   ```
   public void config(MetricConfig config) {
       synchronized (lock) {    
            this.config = config;  
        }
   }
   ```
   
   Since it's possible to set and get in the mean time, we should have lock in 
the getter as well
   
   Refer to [KAFKA-16381](https://issues.apache.org/jira/browse/KAFKA-16381).
   
   ## Solution
   Add the lock in the config getter
   
   ## Test
   ```
   ./gradlew cleanTest core:test --tests ConnectionQuotasTest --tests 
ControllerMutationQuotaTest stream:test --tests StandbyTaskTest --tests 
StreamTaskTest
   ```
   and it passed
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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