The test failed on branch=master, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/follower-reads/survival=region/locality=global/reads=exact-staleness/run_1
	follower_reads.go:657,follower_reads.go:319,follower_reads.go:57,test_runner.go:777: too many intervals with more than 2 nodes with low follower read ratios: 5 intervals > 4 threshold. Bad intervals:
		interval 09:02:20-09:02:30: n1 ratio: 1.181 n2 ratio: 0.730 n3 ratio: 0.000 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.158 
		interval 09:03:50-09:04:00: n1 ratio: 0.884 n2 ratio: 0.416 n3 ratio: 0.004 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 1.000 
		interval 09:04:20-09:04:30: n1 ratio: 0.758 n2 ratio: 0.699 n3 ratio: 0.000 n4 ratio: 1.000 n5 ratio: 0.999 n6 ratio: 1.000 
		interval 09:04:50-09:05:00: n1 ratio: 0.000 n2 ratio: 0.000 n3 ratio: 0.514 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 1.000 
		interval 09:05:20-09:05:30: n1 ratio: 0.330 n2 ratio: 0.872 n3 ratio: 1.000 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.457