logging.it.ITLoggingTest: testListSinks failed

[flaky-bot]

This test failed!

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---

commit: 809e0a1
buildURL: Build Status, Sponge
status: failed

Test output

java.lang.IllegalArgumentException: logging.googleapis.com/projects/gcloud-devel/locations/global/buckets/_Required is not a valid sink destination
	at com.google.cloud.logging.SinkInfo$Destination.fromPb(SinkInfo.java:348)
	at com.google.cloud.logging.SinkInfo.fromPb(SinkInfo.java:592)
	at com.google.cloud.logging.Sink.fromPb(Sink.java:259)
	at com.google.cloud.logging.Sink$1.apply(Sink.java:267)
	at com.google.cloud.logging.Sink$1.apply(Sink.java:264)
	at com.google.common.collect.Lists$TransformingRandomAccessList$1.transform(Lists.java:605)
	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47)
	at com.google.cloud.PageImpl$PageIterator.computeNext(PageImpl.java:72)
	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:141)
	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:136)
	at com.google.common.collect.Iterators.addAll(Iterators.java:355)
	at com.google.common.collect.Sets.newHashSet(Sets.java:224)
	at com.google.common.collect.Sets.newHashSet(Sets.java:207)
	at com.google.cloud.logging.BaseSystemTest.testListSinks(BaseSystemTest.java:130)
	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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:288)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:282)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:748)

[nadav-lavy-exa]

This is happening across versions of the lib. - looks to me like underlying issue w the API.