The test failed on branch=release-21.2, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/follower-reads/survival=region/locality=regional/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: 7 intervals > 4 threshold. Bad intervals:
		interval 09:58:40-09:58:50: n1 ratio: 0.651 n2 ratio: 0.804 n3 ratio: 0.029 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 1.000 
		interval 09:59:30-09:59:40: n1 ratio: 0.264 n2 ratio: 1.213 n3 ratio: 0.230 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.655 
		interval 10:00:00-10:00:10: n1 ratio: 0.213 n2 ratio: 1.360 n3 ratio: 0.312 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.814 
		interval 10:00:10-10:00:20: n1 ratio: 0.182 n2 ratio: 1.000 n3 ratio: 0.000 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.743 
		interval 10:00:30-10:00:40: n1 ratio: 0.260 n2 ratio: 1.000 n3 ratio: 0.194 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.637 
		interval 10:01:10-10:01:20: n1 ratio: 0.517 n2 ratio: 1.000 n3 ratio: 0.278 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.614 
		interval 10:01:40-10:01:50: n1 ratio: 0.259 n2 ratio: 1.000 n3 ratio: 0.355 n4 ratio: 1.000 n5 ratio: 1.000 n6 ratio: 0.625