[Tests] PrometheusMetricsTest testAuthMetrics is flaky on branch-2.7

[eolivelli]

This test fails when it is executed with other tests, for example on CI:

[ERROR] testAuthMetrics(org.apache.pulsar.broker.stats.PrometheusMetricsTest)  Time elapsed: 0.067 s  <<< FAILURE!
java.lang.AssertionError: expected [token] but found [tls]
	at org.testng.Assert.fail(Assert.java:99)
	at org.testng.Assert.failNotEquals(Assert.java:1037)
	at org.testng.Assert.assertEqualsImpl(Assert.java:140)
	at org.testng.Assert.assertEquals(Assert.java:122)
	at org.testng.Assert.assertEquals(Assert.java:629)
	at org.testng.Assert.assertEquals(Assert.java:639)
	at org.apache.pulsar.broker.stats.PrometheusMetricsTest.testAuthMetrics(PrometheusMetricsTest.java:771)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
	at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
	at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
	at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

[eolivelli]

I will send a patch shortly

[codelipenghui]

The issue had no activity for 30 days, mark with Stale label.

[tisonkun]

Close as stale. We don't maintain 2.7 anymore.