|   | *
		  |   | * WARNING: RUNNING IN INSECURE MODE!
		  |   | * 
		  |   | * - Your cluster is open for any client that can access <all your IP addresses>.
		  |   | * - Any user, even root, can log in without providing a password.
		  |   | * - Any user, connecting as root, can read or write any data in your cluster.
		  |   | * - There is no network encryption nor authentication, and thus no confidentiality.
		  |   | * 
		  |   | * Check out how to secure your cluster: https://www.cockroachlabs.com/docs/v20.2/secure-a-cluster.html
		  |   | *
		  |   | *
		  |   | * ERROR: ERROR: cockroach server exited with error: store <no-attributes>=/mnt/data1/cockroach, last used with cockroach version v19.1-1, is too old for running version v20.1-21 (which requires data from v20.1 or later)
		  |   | *
		  |   | ERROR: cockroach server exited with error: store <no-attributes>=/mnt/data1/cockroach, last used with cockroach version v19.1-1, is too old for running version v20.1-21 (which requires data from v20.1 or later)
		  |   | Failed running "start"
		  |   | E200929 06:43:42.755194 1 cli/error.go:398  ERROR: exit status 1
		  |   | ERROR: exit status 1
		  |   | Failed running "start"
		  | Wraps: (3) exit status 1
		  | Error types: (1) *withstack.withStack (2) *errutil.withPrefix (3) *exec.ExitError: 
		  | I200929 06:43:42.789482 1 cluster_synced.go:1733  command failed
		Wraps: (2) exit status 1
		Error types: (1) *main.withCommandDetails (2) *exec.ExitError

	cluster.go:1654,context.go:135,cluster.go:1643,test_runner.go:824: dead node detection: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/bin/roachprod monitor teamcity-2328570-1601361596-03-n4cpu4 --oneshot --ignore-empty-nodes: exit status 1 3: 4266
		1: 5283
		2: 4430
		4: dead
		Error: UNCLASSIFIED_PROBLEM: 4: 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) 4: dead
		Error types: (1) errors.Unclassified (2) *withstack.withStack (3) *errutil.leafError