Import these dashboards to Grafana.
The steps are documented at https://grafana.com/docs/grafana/latest/dashboards/export-import/
If you have deployed the Grafana Helm Chart with the dashboard sidecar enabled, you can apply the dashboards.yaml with the following command:
kubectl apply -f https://raw.githubusercontent.com/knative-sandbox/monitoring/main/grafana/dashboards.yaml
For reference, you need to supply the following values:
sidecar:
dashboards:
enabled: true
searchNamespace: ALL