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/20200404-1851713/acceptance/version-upgrade/run_1
	upgrade.go:457,upgrade.go:536,upgrade.go:381,upgrade.go:349,acceptance.go:84,test_runner.go:753: dial tcp 34.71.161.233:26257: connect: connection refused

	cluster.go:1410,context.go:135,cluster.go:1399,test_runner.go:825: dead node detection: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod monitor teamcity-1851713-1585981228-10-n4cpu4 --oneshot --ignore-empty-nodes: exit status 1 3: dead
		4: 4137
		2: 4114
		1: 4586
		Error: UNCLASSIFIED_PROBLEM:
		  - 3: dead
		    main.glob..func13
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1129
		    main.wrap.func1
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:272
		    github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).execute
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:766
		    github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).ExecuteC
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:852
		    github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra.(*Command).Execute
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/vendor/github.com/spf13/cobra/command.go:800
		    main.main
		    	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1793
		    runtime.main
		    	/usr/local/go/src/runtime/proc.go:203
		    runtime.goexit
		    	/usr/local/go/src/runtime/asm_amd64.s:1357