Windows kubelet prints error "Unable to read config path" every 20s

[zhiweiv]

Is this an ISSUE or FEATURE REQUEST?
ISSUE

What version of aks-engine?:
0.34.0

Kubernetes version:
1.14.1

What happened:
Windows kubelet prints error "Unable to read config path" every 20s

E0413 10:54:41.722276    3544 file.go:104] Unable to read config path "/etc/kubernetes/manifests": path does not exist, ignoring
E0413 10:55:01.728055    3544 file.go:104] Unable to read config path "/etc/kubernetes/manifests": path does not exist, ignoring
E0413 10:55:21.729621    3544 file.go:104] Unable to read config path "/etc/kubernetes/manifests": path does not exist, ignoring
E0413 10:55:41.723525    3544 file.go:104] Unable to read config path "/etc/kubernetes/manifests": path does not exist, ignoring
E0413 10:56:01.732765    3544 file.go:104] Unable to read config path "/etc/kubernetes/manifests": path does not exist, ignoring

What you expected to happen:
Kubelet does not output this error

How to reproduce it (as minimally and precisely as possible):
Build a cluster with Windows nodes, check C:\k\kubelet.err.log in Windows nodes.

Anything else we need to know:
I can find --pod-manifest-path=/etc/kubernetes/manifests was passed to kubelet in C:\k\kubeletstart.ps1.

Also in defaults-kubelet.go, it indicates pod-manifest-path shoud not be passed to Windows kubelet, not sure why it is not working.

staticWindowsKubeletConfig := make(map[string]string)
for key, val := range staticLinuxKubeletConfig {
	switch key {
	case "--pod-manifest-path": // Don't add Linux-specific config
		break
	default:
		staticWindowsKubeletConfig[key] = val
	}
}

[CecileRobertMichon]

Azure/acs-engine#3744 fixed this on Linux nodes, we need to apply a parallel change on the Windows provisioning script.

[zhiweiv]

These were really annoying while checking kubelet logs 😟.

[juergenpf]

/assign @juergenpf