How to fix must specify limits.cpu, limits.memory in Kubernetes

# Check ResourceQuota
kubectl get resourcequota -n <namespace>
kubectl describe resourcequota -n <namespace>

# Check LimitRange
kubectl get limitrange -n <namespace>
kubectl describe limitrange -n <namespace>

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: app
    image: nginx:latest
    resources:
      requests:
        cpu: "250m"
        memory: "256Mi"
      limits:
        cpu: "500m"          # Required
        memory: "512Mi"      # Required

kubectl apply -f pod.yaml -n <namespace>

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  template:
    spec:
      containers:
      - name: app
        image: my-image
        resources:
          requests:
            cpu: "100m"
            memory: "128Mi"
          limits:
            cpu: "500m"
            memory: "512Mi"

kubectl apply -f deployment.yaml
kubectl rollout status deployment/my-app

spec:
  containers:
  - name: app
    image: myapp:v1
    resources:
      requests:
        cpu: "250m"
        memory: "256Mi"
      limits:
        cpu: "500m"
        memory: "512Mi"
  - name: sidecar
    image: sidecar:v1
    resources:
      requests:
        cpu: "50m"
        memory: "64Mi"
      limits:
        cpu: "100m"        # Sidecar also needs limits
        memory: "128Mi"

apiVersion: v1
kind: LimitRange
metadata:
  name: default-limits
  namespace: <namespace>
spec:
  limits:
  - type: Container
    default:
      cpu: "500m"
      memory: "512Mi"
    defaultRequest:
      cpu: "250m"
      memory: "256Mi"

# values.yaml
resources:
  requests:
    cpu: "100m"
    memory: "128Mi"
  limits:
    cpu: "500m"
    memory: "256Mi"

# templates/deployment.yaml
resources:
  {{- toYaml .Values.resources | nindent 6 }}

helm upgrade --install myapp ./chart -n <namespace>