Helm template does not contain information about serviceMonitor

Question

I am trying to deploy ingress controller with service monitor, i am using helm values file which looks like that:

controller:
  replicaCount: 3
  minAvailable: 1

  config:
    use-forwarded-headers: "true"
    use-proxy-protocol: "true"
    keep-alive: "3600"
  service:
    externalTrafficPolicy: Local
    type: LoadBalancer
  metrics:
    enabled: true
    serviceMonitor:
      enabled: true

rbac:
  create: true

serviceAccount:
  create: true
  name: nginx-ingress-serviceaccount

when i run helm template with my values file provided, service monitor is not visible.

helm template ingress-nginx/ingress-nginx --values values.yaml --version "4.0.5"

Does anyone had similar problem? Thanks in advance for your replies.

Answer 1

ServiceMonitor has 3 conditions to be populated, make sure that your cluster and configs meet these conditions: https://github.com/kubernetes/ingress-nginx/blob/6299c39842c31ff1e17d72503003ca36e2976a9a/charts/ingress-nginx/templates/controller-servicemonitor.yaml#L1

your cluster should support: monitoring.coreos.com/v1 API version

if you use an older chart version where the API condition is not there, you will be able to deploy the ServiceMonitor with your current values.yaml

helm template ingress-nginx/ingress-nginx --values values.yaml --version "3.15.2" | grep -i mon
# Source: ingress-nginx/templates/controller-servicemonitor.yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor

Also, note that: https://helm.sh/docs/helm/helm_template/

Render chart templates locally and display the output.

Any values that would normally be looked up or retrieved in-cluster will be faked locally. Additionally, none of the server-side testing of chart validity (e.g. whether an API is supported) is done.

This means if you run the command line on your machine, it will never show the ServiceMonitor unless you have a local k8s cluster that supports monitoring.coreos.com/v1 or you fake it too :) as below

helm template ingress-nginx/ingress-nginx --values values.yaml --version "4.0.5" --api-versions "monitoring.coreos.com/v1" | grep -i mon
# Source: ingress-nginx/templates/controller-servicemonitor.yaml
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor