Kubernetes Metrics Server
Headlamp can show information for resource usage if the Metrics Server is installed. If the Metrics Server is not installed, then a related notice is displayed as shown in the following screenshot:
To read more about metrics server check out the metrics-server documentation.
Minikube​
If you are running Minikube, then you can install the Metrics Server by enabling the respective add-on. i.e.:
minikube addons enable metrics-server