Flaky-test: SchemaServiceTest.testSchemaRegistryMetrics

[lhotari]

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• [X] I searched in the issues and found nothing similar.

Example failure

https://github.com/apache/pulsar/actions/runs/11328656119/job/31502934109?pr=23442#step:11:1338

Exception stacktrace

  Error:  Tests run: 30, Failures: 1, Errors: 0, Skipped: 17, Time elapsed: 59.073 s <<< FAILURE! - in org.apache.pulsar.broker.service.schema.SchemaServiceTest
  Error:  org.apache.pulsar.broker.service.schema.SchemaServiceTest.testSchemaRegistryMetrics  Time elapsed: 0.053 s  <<< FAILURE!
  java.lang.AssertionError: expected [tenant/ns] but found [public/ns_73b1a31afce34671a5ddc48fe5ad7fc8]
  	at org.testng.Assert.fail(Assert.java:110)
  	at org.testng.Assert.failNotEquals(Assert.java:1577)
  	at org.testng.Assert.assertEqualsImpl(Assert.java:149)
  	at org.testng.Assert.assertEquals(Assert.java:131)
  	at org.testng.Assert.assertEquals(Assert.java:655)
  	at org.testng.Assert.assertEquals(Assert.java:665)
  	at org.apache.pulsar.broker.service.schema.SchemaServiceTest.testSchemaRegistryMetrics(SchemaServiceTest.java:184)
  	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
  	at org.testng.internal.invokers.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:139)
  	at org.testng.internal.invokers.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:47)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:76)
  	at org.testng.internal.invokers.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
  	at java.base/java.lang.Thread.run(Thread.java:1583)

Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!