The test failed on branch=master, cloud=gce:
test artifacts and logs in: /artifacts/follower-reads/mixed-version/single-region/run_1
	follower_reads.go:305,follower_reads.go:883,follower_reads.go:100,test_runner.go:875: fewer than 2 follower reads occurred: saw [0 0 0] before and [0 100 0] after