External

Internal

The Prometheus adapter is a Kubernetes Aggregation Layer extension.

https://github.com/prometheus-community/helm-charts/tree/main/charts/prometheus-adapter

The adapter will be installed in the same namespace as Prometheus.

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm search repo prometheus-community

helm install -n prometheus prometheus-adapter prometheus-community/prometheus-adapter -f ./prometheus-adapter-overlay.yaml:

See Configuration below for prometheus-adapter-overlay.yaml.

Test installation:

kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1 | jq

{
  "kind": "APIResourceList",
  "apiVersion": "v1",
  "groupVersion": "custom.metrics.k8s.io/v1beta1",
  "resources": []
}

https://github.com/prometheus-community/helm-charts/tree/main/charts/prometheus-adapter#configuration

Use the following prometheus-adapter-overlay.yaml:

helm show values prometheus-community/prometheus-adapter > ~/tmp/prometheus-adapter-overlay.yaml

Increase log level when installing the chart.

tail the logs, Prometheus connection refused is reported there.