The test failed on branch=release-19.2, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/20200304-1783236/kv/contention/nodes=4/run_1
	ts_util.go:130,kv.go:259,cluster.go:2344,errgroup.go:57: spent 75.438596% of time below target of 100.000000 txn/s, wanted no more than 5.000000%

	cluster.go:2368,kv.go:262,test_runner.go:741: error with attached stack trace:
		    main.(*monitor).WaitE
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2356
		    main.(*monitor).Wait
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2364
		    main.registerKVContention.func1
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/kv.go:262
		    main.(*testRunner).runTest.func2
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/test_runner.go:741
		    runtime.goexit
		    	/usr/local/go/src/runtime/asm_amd64.s:1357
		  - monitor failure:
		  - error with attached stack trace:
		    main.(*monitor).wait.func2
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2412
		    runtime.goexit
		    	/usr/local/go/src/runtime/asm_amd64.s:1357
		  - monitor task failed:
		  - error with attached stack trace:
		    main.init
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2309
		    runtime.doInit
		    	/usr/local/go/src/runtime/proc.go:5222
		    runtime.main
		    	/usr/local/go/src/runtime/proc.go:190
		    runtime.goexit
		    	/usr/local/go/src/runtime/asm_amd64.s:1357
		  - Goexit() was called