docs: Rename cost optimization guide for consistency and update references

- Renamed COST_OPTIMIZATION.md to COST_OPTIMIZATION_GUIDE.md
- Updated DEPLOYMENT_GUIDE.md to reference the new filename
- Removed the old file for clarity

Author: srnichols

docs/COST_OPTIMIZATION_GUIDE.md

@@ -0,0 +1,77 @@
+# 💰 Azure Stamps Pattern - Cost Optimization Guide
+
+> **Purpose:** This guide helps architects, DevOps, and IT leaders make informed decisions about cost management and optimization when deploying and operating the Azure Stamps Pattern.
+
+---
+
+## 🎯 Overview
+
+Cost optimization in the Azure Stamps Pattern is about balancing performance, reliability, and compliance with efficient resource usage. This guide covers:
+- Cost-saving strategies for each architectural layer
+- Azure-native tools for monitoring and controlling spend
+- Tips for right-sizing, scaling, and automation
+- Real-world examples and best practices
+
+---
+
+## 🏗️ Cost Optimization by Layer
+
+### 1. **Global Layer**
+- **Azure Front Door/Traffic Manager**: Use standard SKUs unless advanced features are required.
+- **DNS Zones**: Consolidate DNS zones where possible.
+- **Global Cosmos DB**: Use multi-region writes only if required; otherwise, prefer single-region for cost savings.
+
+### 2. **Regional Layer**
+- **App Gateway**: Use auto-scaling and WAF policies to avoid over-provisioning.
+- **Key Vault**: Use standard tier unless HSM-backed keys are required.
+- **Log Analytics**: Set retention policies and use basic logs for non-critical data.
+
+### 3. **CELL Layer**
+- **Container Apps**: Enable scale-to-zero for dev/test environments.
+- **SQL/Cosmos DB**: Use serverless or auto-scale tiers for unpredictable workloads.
+- **Storage**: Apply lifecycle management to move blobs to cool/archive tiers.
+- **Redis**: Use basic or standard tiers for non-critical caching.
+
+---
+
+## ⚡ General Cost-Saving Strategies
+
+- **Right-Size Resources**: Start small and scale up as needed.
+- **Auto-Scaling**: Use Azure autoscale for compute and databases.
+- **Dev/Test vs. Prod**: Use lower-cost SKUs for non-production environments.
+- **Resource Tagging**: Tag resources by environment, owner, and project for cost tracking.
+- **Budgets & Alerts**: Set up Azure Cost Management budgets and alerts.
+- **Reservation & Savings Plans**: Use reserved instances for predictable workloads.
+- **Delete Unused Resources**: Regularly audit and remove orphaned resources.
+
+---
+
+## 📊 Monitoring & Reporting
+
+- **Azure Cost Management + Billing**: Analyze spend, forecast, and set budgets.
+- **Log Analytics**: Track resource utilization and identify underused assets.
+- **Application Insights**: Monitor app performance to avoid over-provisioning.
+- **Custom Dashboards**: Build dashboards for per-CELL, per-region, and per-service cost visibility.
+
+---
+
+## 📝 Example: Cost Optimization Checklist
+
+- [ ] Use serverless or auto-scale for databases
+- [ ] Enable scale-to-zero for dev/test container apps
+- [ ] Apply storage lifecycle policies
+- [ ] Set up cost alerts and budgets
+- [ ] Review and right-size SKUs quarterly
+- [ ] Tag all resources for cost allocation
+- [ ] Use reserved instances for production workloads
+
+---
+
+## 🔗 Further Reading
+- [Azure Cost Management Documentation](https://docs.microsoft.com/en-us/azure/cost-management-billing/)
+- [Azure Pricing Calculator](https://azure.microsoft.com/en-us/pricing/calculator/)
+- [Well-Architected Cost Optimization](https://docs.microsoft.com/en-us/azure/architecture/framework/cost/)
+
+---
+
+**Tip:** Cost optimization is a continuous process—review usage and adjust regularly for maximum savings!

docs/DEPLOYMENT_GUIDE.md

@@ -986,4 +986,4 @@ az resource delete --ids $(az resource list --resource-group $RESOURCE_GROUP_NAM
 - [Architecture Guide](./ARCHITECTURE_GUIDE.md)
 - [Operations Guide](./OPERATIONS_GUIDE.md)
 - [Security Baseline](./SECURITY_GUIDE.md)
-- [Cost Optimization](./COST_OPTIMIZATION.md)
+ - [Cost Optimization](./COST_OPTIMIZATION_GUIDE.md)