Kubernetes ReplicaSets - считается устаревшей. Рекомендуется использовать Deployments

$ cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: ReplicaSet
metadata:
    name: rs-quarkus-demo
spec:
    replicas: 3
    selector:
       matchLabels:
          app: quarkus-demo
    template:
       metadata:
          labels:
             app: quarkus-demo
             env: dev
       spec:
          containers:
          - name: quarkus-demo
            image: quay.io/burrsutter/quarkus-demo:1.0.0
EOF

// $ kubectl get pods --show-labels
$ kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
rs-quarkus-demo-62z29   1/1     Running   0          7s
rs-quarkus-demo-d67vd   1/1     Running   0          7s
rs-quarkus-demo-pgqds   1/1     Running   0          7s

$ kubectl delete pod rs-quarkus-demo-62z29

// $ kubectl get replicasets
$ kubectl get rs
NAME              DESIRED   CURRENT   READY   AGE
rs-quarkus-demo   3         3         3       38s

$ kubectl delete replicaset rs-quarkus-demo