instruction: Create a Kubernetes ReplicaSet configuration with best practices
output: ```yaml
  apiVersion: apps/v1
  kind: ReplicaSet
  metadata:
   name: frontend
   labels:
   app: guestbook
   tier: frontend
  spec:
   # modify replicas according to your case
   replicas: 3
   selector:
   matchLabels:
   tier: frontend
   template:
   metadata:
   labels:
   tier: frontend
   spec:
   containers:
   - name: php-redis
   image: us-docker.pkg.dev/google-samples/containers/gke/gb-frontend:v5
  ```