Flaky test: TestBrokerProxy brokerProxyUpdateLatencyMetrics

:samza-kafka_2.11:test

brokerProxyUpdateLatencyMetrics FAILED
    java.lang.AssertionError: expected:<500> but was:<-1>
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.failNotEquals(Assert.java:645)
        at org.junit.Assert.assertEquals(Assert.java:126)
        at org.junit.Assert.assertEquals(Assert.java:470)
        at org.junit.Assert.assertEquals(Assert.java:454)
        at org.apache.samza.system.kafka.TestBrokerProxy.brokerProxyUpdateLatencyMetrics(TestBrokerProxy.scala:213)

84 tests completed, 1 failed
:samza-kafka_2.11:test FAILED

FAILURE: Build failed with an exception.