# Using a load balancer with multiple targets
def create_multi_target_channel():
    targets = [
        'user-service-1.example.com:50051',
        'user-service-2.example.com:50051',
        'user-service-3.example.com:50051',
    ]
    
    # Use a service mesh or load balancer
    channel = grpc.insecure_channel(
        f'ipv4:///{",".join(targets)}',
        options=[('grpc.lb_policy_name', 'round_robin')]
    )
    
    return channel
```

## Kubernetes deployment

Deploy gRPC services on Kubernetes:

```yaml title="grpc-service.yaml"
apiVersion: apps/v1
kind: Deployment
metadata:
  name: user-service
spec:
  replicas: 3
  selector:
    matchLabels:
      app: user-service
  template:
    metadata:
      labels:
        app: user-service
    spec:
      containers:
      - name: user-service
        image: user-service:latest
        ports:
        - containerPort: 50051
          name: grpc
        env:
        - name: GRPC_PORT
          value: "50051"
        livenessProbe:
          exec:
            command: ["/bin/grpc_health_probe", "-addr=:50051"]
          initialDelaySeconds: 30
        readinessProbe:
          exec:
            command: ["/bin/grpc_health_probe", "-addr=:50051"]
          initialDelaySeconds: 5
---
apiVersion: v1
kind: Service
metadata:
  name: user-service
spec:
  selector:
    app: user-service
  ports:
  - port: 50051
    targetPort: 50051
    name: grpc
  type: ClusterIP
```

## Monitoring and observability

Add monitoring and tracing to your gRPC server:

```python title="monitored_server.py"
import grpc
import time
from prometheus_client import Counter, Histogram, start_http_server