The test failed on branch=master, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/engine/switch/encrypted/nodes=3/run_1
	cluster.go:2654,engine_switch.go:132,engine_switch.go:155,test_runner.go:755: monitor failure: unexpected node event: 1: dead
		(1) attached stack trace
		  -- stack trace:
		  | main.(*monitor).WaitE
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2642
		  | main.(*monitor).Wait
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster.go:2650
		  | main.registerEngineSwitch.func1
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/engine_switch.go:132
		  | main.registerEngineSwitch.func3
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/engine_switch.go:155
		  | main.(*testRunner).runTest.func2
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachtest/test_runner.go:755
		  | runtime.goexit
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1357
		Wraps: (2) monitor failure
		Wraps: (3) unexpected node event: 1: dead
		Error types: (1) *withstack.withStack (2) *errutil.withPrefix (3) *errors.errorString

	cluster.go:1657,context.go:135,cluster.go:1646,test_runner.go:836: dead node detection: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod monitor teamcity-2350967-1602224087-09-n4cpu4 --oneshot --ignore-empty-nodes: exit status 1 4: skipped
		3: 5223
		2: 4867
		1: dead
		Error: UNCLASSIFIED_PROBLEM: 1: dead
		(1) UNCLASSIFIED_PROBLEM
		Wraps: (2) attached stack trace
		  -- stack trace:
		  | main.glob..func14
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1143
		  | main.wrap.func1
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:267
		  | github.com/spf13/cobra.(*Command).execute
		  | 	/home/agent/work/.go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:830
		  | github.com/spf13/cobra.(*Command).ExecuteC
		  | 	/home/agent/work/.go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:914
		  | github.com/spf13/cobra.(*Command).Execute
		  | 	/home/agent/work/.go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:864
		  | main.main
		  | 	/home/agent/work/.go/src/github.com/cockroachdb/cockroach/pkg/cmd/roachprod/main.go:1839
		  | runtime.main
		  | 	/usr/local/go/src/runtime/proc.go:203
		  | runtime.goexit
		  | 	/usr/local/go/src/runtime/asm_amd64.s:1357
		Wraps: (3) 1: dead
		Error types: (1) errors.Unclassified (2) *withstack.withStack (3) *errutil.leafError