add Q4

Q4-Scalability/README.md

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+# Q4 - Scalability & Load Balancing
+
+## Objective
+
+Design a scalable architecture capable of handling **15,000 requests per second** on the Ghaymah Container Platform.
+
+---
+
+## Proposed Architecture
+
+The solution uses:
+
+- Ghaymah Load Balancer
+- 39 Application Containers
+- PostgreSQL Database
+- Redis Cache
+- Ghaymah Block Storage
+- Monitoring and Health Checks
+
+The Load Balancer distributes incoming traffic evenly across all application containers while health checks ensure traffic is only routed to healthy instances.
+
+---
+
+## Container Calculation
+
+Expected Traffic
+
+- 15,000 requests/second
+
+Container Capacity
+
+- 500 requests/second
+
+Required Containers
+
+15000 / 500 = 30
+
+Including 30% reserve capacity
+
+30 × 1.3 = 39 containers
+
+---
+
+## Cold Start Strategy
+
+The platform keeps additional warm containers available to reduce startup latency during sudden traffic spikes.
+
+New containers are automatically created when resource utilization reaches the defined thresholds and are added to the Load Balancer only after passing health checks.
+
+---
+
+## Ghaymah Block Storage
+
+Persistent storage is attached to the database layer to ensure application data survives container restarts and deployments.
+
+Suitable workloads include:
+
+- Databases
+- Logs
+- Uploaded files
+- Stateful applications
+
+---
+
+## Monitoring
+
+The deployment should continuously monitor:
+
+- CPU Utilization
+- Memory Usage
+- Response Time
+- Error Rate
+- Container Health
+- Restart Count
+
+Alerts should be triggered before resources reach critical levels to prevent service interruption.

Q4-Scalability/calculations.md

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+# Container Capacity Calculation
+
+## Given
+
+- Expected Traffic = 15,000 requests/second
+- One container capacity = 500 requests/second
+- Required headroom = 30%
+
+---
+
+## Step 1
+
+Number of containers without headroom
+
+15000 / 500 = 30 Containers
+
+---
+
+## Step 2
+
+Adding 30% reserve capacity
+
+30 × 1.30 = 39 Containers
+
+---
+
+## Final Result
+
+The application should run **39 containers** to safely handle the expected traffic while maintaining additional capacity for sudden traffic spikes and infrastructure failures.