The test failed on branch=release-22.1, cloud=gce:
test artifacts and logs in: /artifacts/backup/KMS/GCS/n3cpu4/run_1
	monitor.go:127,backup.go:424,test_runner.go:875: monitor failure: monitor task failed: dial tcp 34.148.97.218:26257: connect: connection refused
		(1) attached stack trace
		  -- stack trace:
		  | main.(*monitorImpl).WaitE
		  | 	main/pkg/cmd/roachtest/monitor.go:115
		  | main.(*monitorImpl).Wait
		  | 	main/pkg/cmd/roachtest/monitor.go:123
		  | github.com/cockroachdb/cockroach/pkg/cmd/roachtest/tests.registerBackup.func2
		  | 	github.com/cockroachdb/cockroach/pkg/cmd/roachtest/tests/backup.go:424
		  | [...repeated from below...]
		Wraps: (2) monitor failure
		Wraps: (3) attached stack trace
		  -- stack trace:
		  | main.(*monitorImpl).wait.func2
		  | 	main/pkg/cmd/roachtest/monitor.go:171
		  | runtime.goexit
		  | 	GOROOT/src/runtime/asm_amd64.s:1581
		Wraps: (4) monitor task failed
		Wraps: (5) dial tcp 34.148.97.218:26257
		Wraps: (6) connect
		Wraps: (7) connection refused
		Error types: (1) *withstack.withStack (2) *errutil.withPrefix (3) *withstack.withStack (4) *errutil.withPrefix (5) *net.OpError (6) *os.SyscallError (7) syscall.Errno