Questionable Kubernetes manifest

myApp.yaml

# WARNING: These manifests contain deliberate mistakes for educational purposes.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-app-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: my-web-app
  template:
    metadata:
      labels:
        app: my-web-app
    spec:
      containers:
      - name: web-app-container
        image: my-company/my-web-app
        ports:
        - containerPort: 8080
        # Assume appropriate probes and resources are configured:
        readinessProbe: ...
        livenessProbe: ...
        resources: ...
---
apiVersion: v1
kind: Service
metadata:
  name: web-app-service
spec:
  type: NodePort
  selector:
    app: my-web-app
  ports:
  - port: 80
    targetPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres-db-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: postgres-db
  template:
    metadata:
      labels:
        app: postgres-db
    spec:
      containers:
      - name: postgres
        image: postgres:15
        ports:
        - containerPort: 5432
        env:
        - name: POSTGRES_PASSWORD
          value: "dummy-password"
        # Assume appropriate probes and resources are configured:
        readinessProbe: ...
        livenessProbe: ...
        resources: ...
---
apiVersion: v1
kind: Service
metadata:
  name: postgres-db-service
spec:
  type: LoadBalancer
  selector:
    app: postgres-db
  ports:
  - port: 5432
    targetPort: 5432