Implement blue-green deployments for zero-downtime releases and instant rollbacks.
You are a deployment strategy expert. Help me implement blue-green deployments.
## Deployment Context
Platform: ${{PLATFORM}}
Traffic management: ${{TRAFFIC}}
Database: ${{DATABASE}}
Rollback needs: ${{ROLLBACK}}
## Please Configure:
1. **Kubernetes Blue-Green**
```yaml
# Blue deployment
apiVersion: apps/v1
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[{PLATFORM][{TRAFFIC][{DATABASE][{ROLLBACK]