Need pod labels in kube-state-metrics

[kmurthyms]

What did you do?

I have a similar issue as mentioned in kubernetes/kube-state-metrics#536 and
prometheus-operator/prometheus-operator#3460
I need all the pod labels to be present in the metrics , so that based on the label i could have the alert routing configured

We have the standrad set of kubenertes-state-metrics rules deployed and i don't want to modify them to add join mertrics . since this is a standard set of rules that we pull from community(https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack) and modifying this would add maintenance overhead every time we update.

so is there a way to get all the pod labels without modifying the rules ?

• Prometheus Operator version:

prometheus-operator:
    Image:      quay.io/coreos/prometheus-operator:v0.38.1

`Insert image tag or Git SHA here`
<!-- Try: kubectl -n monitoring describe deployment prometheus-operator -->

• Kubernetes version information:

  kubectl version

Client Version: v1.19.3
Server Version: v1.15.12-eks-31566f

[lilic]

Hello 👋 when you mean pod labels, do you mean the kube_pod_labels metrics or labels on other pod metrics?

[kmurthyms]

Hello , I mean the labels on the pod
What i am trying to achieve is to have generic implementation for an alertmanager route for my kubernetes workloads
Example: I have a label on every pod/service/rs "owner=<team_name>" , with which i want have an alert manager route option to route alerts based on team_name . with kube-state-metrics , when the KubePodCrashing alert fires up , i want to fire notification to the corresponding team based on this label , to achieve this i need the pod/service labels. the alert Rules are standard rules that we borrow from community and i don't want to modify these to rules to add join metrics on kube_pod_labels or kube_service_labels (kubernetes/kube-state-metrics#536 (comment)). is there any way in which i could pass a label extracted from kube_<workload>_labels to other metrics ?

[paulfantom]

Seems like something that could be done with kube-state-metrics 2.0 and applied as a jsonnet patch/addon to the project. Since this is a pretty frequent request I am adding a feature label.

[kmurthyms]

@paulfantom , would like to know is this feature included in kube-state-metrics 2.0 ? i explored the docs and couldn't figure out a way, can you let me know if i can achieve this ?

[LeoQuote]

I believe it can be done with a group_right kube_pod_labels but we do need an addon to do this as manually replace these rules is pretty tiring.

[paulfantom]

Yes, exactly what @LeoQuote suggests. We need a jsonnet addon.

[dVerhees]

I just randomly came across this issue looking for a solution to a similar problem.
Aren't you looking for this?
kubernetes/kube-state-metrics#1489

or for the helm chart you mentioned:
prometheus-community/helm-charts#1235 (comment)

[kiril-dayradzhiev]

Is there a resolution of the issue with missing "custom pod labels"(coming from the pod itself) inside "kube_pod_labels" metric?

When I did use the following config:

kube-state-metrics:
  prometheus:
    monitor:
      metricRelabelings:
        - action: labelmap
          regex: __meta_kubernetes_pod_label_(.+)
          replacement: pod_label_$1

      relabelings:
        - action: labelmap
          regex: __meta_kubernetes_pod_label_(.+)
          replacement: pod_label_$1

I have got only the following additional labels(custom specified pod labels are still missing):

        "metric": {
          "__name__": "kube_pod_labels",
          "container": "kube-state-metrics",
          "endpoint": "http",
          "instance": "100.96.0.140:8080",
          "job": "kube-state-metrics",
          "namespace": "default",
          "pod": "webapp-deployment-cf4f7dfc7-nl469",
          "pod_label_app_kubernetes_io_component": "metrics",
          "pod_label_app_kubernetes_io_instance": "prometheus",
          "pod_label_app_kubernetes_io_managed_by": "Helm",
          "pod_label_app_kubernetes_io_name": "kube-state-metrics",
          "pod_label_app_kubernetes_io_part_of": "kube-state-metrics",
          "pod_label_app_kubernetes_io_version": "2.3.0",
          "pod_label_helm_sh_chart": "kube-state-metrics-4.4.3",
          "pod_label_pod_template_hash": "57c988498f",
          "pod_label_release": "prometheus",
          "service": "prometheus-kube-state-metrics",
          "uid": "db48a0a8-ddf9-4bd8-aad3-ec070ada16c5"
        },

[gurpalw]

Glad i've found this issue as it pretty much confirms i wasn't going crazy when i realised that the current chart doesn't support custom pod labels in metrics to enable routing based on custom labels. the only way to do this currently is to disable all of the default rules in the kube-prom-stack chart, and re-write them manually. It would be great if the chart supported this out of the box.

[jcputter]

Found this issue and the following worked for me

kube-state-metrics:
          extraArgs:
          - --metric-labels-allowlist=pods=[*]

[lmyslinski]

This case really needs to be included in the examples. For anyone else going down this rabbit hole:

1. Create a new file utils.libsonnet alongside your main *promstack.jsonnet file:

{
  addArgs(args, name, containers): std.map(
    function(c)
      if c.name == name then
        c {
          args+: args,
        }
      else c,
    containers,
  ),
}

Now in the main jsonnet file add an import at the top:

local addArgs = (import './utils.libsonnet').addArgs;

Finally, below the values section:

  kubeStateMetrics+:: {
    deployment+: {
      spec+: {
        template+: {
          spec+: {            
            containers: addArgs(['--metric-labels-allowlist=pods=[*]'], 'kube-state-metrics', super.containers),
          },
        },
      },
    },
  },

There's probably a way to import that addArgs from somewhere but I haven't figured it out. This works

[BrewToR]

Hi @kmurthyms
Did you get something working without rewriting all the builtins alerts since you post this issue ?