I can not find where is the namespace has been assigned in the LimitRange - mem-limit-range.

Need to add:-

1- Save the " LimitRange - mem-limit-range" as a mem-limit-range.yaml:
2- Run the below command:-
kubectl apply -f mem-limit-range.yaml --namespace=tenant-b-100mi

Same issue in the pod definition, we need to add namespace=tenant-b-100mi on the metadata section.

Reference:-
https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/memory-constraint-namespace/

As per title

failed:
sudo ETCDCTL_API=2 etcdctl cluster-health
sudo ETCDCTL_API=2 etcdctl --ca-file="/var/lib/minikube/certs/etcd/ca.crt" --cert-file="/var/lib/minikube/certs/apiserver-etcd-client.crt" --key-file="/var/lib/minikube/certs/apiserver-etcd-client.key" --endpoints "https://127.0.0.1:2379" cluster-health

worked:
sudo etcdctl --cluster=true endpoint health --cacert="/var/lib/minikube/certs/etcd/ca.crt" --cert="/var/lib/minikube/certs/apiserver-etcd-client.crt" --key="/var/lib/minikube/certs/apiserver-etcd-client.key"

As per https://github.com/cncf/curriculum/blob/master/CKA_Curriculum_v1.28.pdf

Is this study guide relevant to the latest curriculum 1.14.1?

Is this lab possible on the exam? I didn't saw it in any course I did. (I know how to list members, create backup, check backups and restore backups for etcd).

Ingress v1beta has been deprecated, and there is a bit of syntax change in the service definition, i.e. instead of serviceName and servicePort:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  creationTimestamp: null
  name: ingressName
spec:
  ingressClassName: default
  rules:
  - host: foo.com
    http:
      paths:
      - backend:
          service:
            name: svcName
            port:
              number: 80
        path: /bar
        pathType: Exact
status:
  loadBalancer: {}

As per title.