How to not expose port to the internet?

Traefik Traefik v2 (latest)
1

Hi
I am very new to Traefik and Kubernetes. I installed Traefik through helm. Then I wanted to get prometheus metrics from it.

Here is an extract of my values.yaml file:

ports:
  metrics:
    expose: true
    port: 3333
    exposedPort: 3333
    protocol: TCP

additionalArguments:
  - "--metrics.prometheus=true"
  - "--metrics.prometheus.buckets=0.100000, 0.300000, 1.200000, 5.000000"
  - "--metrics.prometheus.addEntryPointsLabels=true"
  - "--metrics.prometheus.addServicesLabels=true"
  - "--entrypoints.metrics.address=:3333/tcp"
  - "--metrics.prometheus.entryPoint=metrics"

My problem is: this configuration exposes the TCP port 3333 to the Internet. For security reasons, I would prefer to avoid this.

Is there a way to expose the port 3333 only to my cluster ?

Regards