Install kube-state-metrics v2 in kubernetes 1.17 fails with error "unknown flag: --collectors"

[vukasin-nikodijevic]

What happened:
Updated image tag to:

-         image: "k8s.gcr.io/kube-state-metrics/kube-state-metrics:v1.9.8"
+         image: "k8s.gcr.io/kube-state-metrics/kube-state-metrics:v2.0.0-rc.1"

What you expected to happen:
kube-state-metrics pod start without any issue

How to reproduce it (as minimally and precisely as possible):
Just update image tag to v2.0.0-rc.1

Anything else we need to know?:

Environment:

• kube-state-metrics version: v2.0.0-rc.1
• Kubernetes version (use kubectl version):

Client Version: version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.4", GitCommit:"e87da0bd6e03ec3fea7933c4b5263d151aafd07c", GitTreeState:"clean", BuildDate:"2021-02-22T19:05:30Z", GoVersion:"go1.15.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.16", GitCommit:"d88fadbd65c5e8bde22630d251766a634c7613b0", GitTreeState:"clean", BuildDate:"2020-12-18T15:59:27Z", GoVersion:"go1.13.15", Compiler:"gc", Platform:"linux/amd64"}

• Cloud provider or hardware configuration: Azure AKS
• Other info:

After installed, the ksm pod will go into CrashLoopBackOff state with following error log:

╰─➤  k logs kube-state-metrics-58c6d8d7b8-88b8r
unknown flag: --collectors
Usage of /kube-state-metrics:
unknown flag: --collectors
      --add_dir_header                   If true, adds the file directory to the header of the log messages
      --alsologtostderr                  log to standard error as well as files
.
.
.
.

If you check master branch --collectors option is still present without any conditioning based on the image version tag:
https://github.com/kubernetes/kube-state-metrics/blob/master/charts/kube-state-metrics/templates/deployment.yaml#L71

[lilic]

Thanks for your report, I assume this is done via helm? I don't know if helm chart is v2.0 ready, but this flag was renamed to --resources? cc @mrueg @tariq1890

Also I suggest using the k8s.gcr.io/kube-state-metrics/kube-state-metrics:v2.0.0 as v2.0 is out now.

[mrueg]

The helm chart is not upgraded yet and we will once we're migrated to the new repository.
Please track prometheus-community/helm-charts#839 and #1448 for further information.

[vukasin-nikodijevic]

@mrueg - any eta because this is real blocker for having KSM in Kubernetes v1.17+, in or without combination with kube-prometheus-stack.

Plz, be aware that 1.17 is pretty low version of kubernetes now days.