"logging before flag.Parse" Errors Observed For metrics-server POD.

Problem

The following errors are observed in metrics-server-nannycontainer logs of metrics-serverPOD.

Errors
    
 
# kubectl logs metrics-server-v0.5.0-5fd89488cd-dng75 -n kube-system metrics-server-nannyERROR: logging before flag.Parse: I1003 14:54:21.545085       1 pod_nanny.go:68] Invoked by [/pod_nanny --config-dir=/etc/config --cpu=40m --extra-cpu=0.5m --memory=40Mi --extra-memory=4Mi --threshold=5 --deployment=metrics-server-v0.5.0 --container=metrics-server --poll-period=30000 --estimator=exponential --minClusterSize=16 --use-metrics=true]ERROR: logging before flag.Parse: I1003 14:54:21.545257       1 pod_nanny.go:69] Version: 1.8.14ERROR: logging before flag.Parse: I1003 14:54:21.545318       1 pod_nanny.go:85] Watching namespace: kube-system, pod: metrics-server-v0.5.0-5fd89488cd-dng75, container: metrics-server.ERROR: logging before flag.Parse: I1003 14:54:21.545352       1 pod_nanny.go:86] storage: MISSING, extra_storage: 0GiERROR: logging before flag.Parse: I1003 14:54:21.645992       1 pod_nanny.go:116] cpu: 40m, extra_cpu: 0.5m, memory: 40Mi, extra_memory: 4MiERROR: logging before flag.Parse: I1003 14:54:21.646061       1 pod_nanny.go:145] Resources: [{Base:{i:{value:40 scale:-3} d:{Dec:<nil>} s:40m Format:DecimalSI} ExtraPerNode:{i:{value:5 scale:-4} d:{Dec:<nil>} s: Format:DecimalSI} Name:cpu} {Base:{i:{value:41943040 scale:0} d:{Dec:<nil>} s: Format:BinarySI} ExtraPerNode:{i:{value:4194304 scale:0} d:{Dec:<nil>} s:4Mi Format:BinarySI} Name:memory}]
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No adverse effect observed on the monitoring stack or Platform9 Managed Kubernetes cluster.

Environment

Platform9 Managed Kubernetes - All Versions
Metric Server
Add-on Resizer

Cause

Add-on Resizer use Google/glog as logging library.

Add-On Resizer Code snippet
    
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https://github.com/kubernetes/autoscaler/blob/addon-resizer-release-1/addon-resizer/nanny/main/pod_nanny.go#L45 package main import ("fmt""io/ioutil""os""time"..."k8s.io/apimachinery/pkg/api/resource""k8s.io/autoscaler/addon-resizer/nanny" "github.com/golang/glog"   <-------------------------------"k8s.io/apimachinery/pkg/runtime"..."path/filepath")
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A commit in glog seems to be responsible for generating those error messages but there are no adverse effects of these messages on metric server or cluster functionality.
The compatible changes for this commit have not done in Kubernetes code, instead it is considered as a caveat.

Resolution

Since Kubernetes considers this as a caveat and there are no adverse effect reported for these errors hence we can safely ignore them.

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