# Techtide Azure Waf Cost Optimization Review

> Review Azure workload cost posture against the Well-Architected Framework Cost Optimization pillar: cost modeling, rightsizing, reservations, hybrid benefit, storage lifecycle, and idle resource elimination.

- Skill: `techtideohio/techtide-azure-waf-cost-optimization-review` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add techtideohio/techtide-azure-waf-cost-optimization-review`
- Raw SKILL.md: https://api.skillmd.com/api/skills/techtideohio/techtide-azure-waf-cost-optimization-review/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: TechTideOhio (https://skillmd.com/u/techtideohio)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/techtideohio/techtide-azure-waf-cost-optimization-review

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# Azure WAF Cost Optimization Review

The Azure Well-Architected Framework Cost Optimization pillar focuses on designing workloads that maximize the value delivered while minimizing unnecessary Azure spending.

## 5 Cost Optimization Design Principles

1. **Develop a cost model** - model costs before deployment; estimate spend based on requirements; track cost KPIs
2. **Design with a cost-efficiency mindset** - favor managed services, consumption-based pricing, and right-sized resources
3. **Design for usage optimization** - enable auto-scaling; schedule workloads; use spot/low-priority VMs for fault-tolerant jobs
4. **Design for rate optimization** - commit to consistent usage via Azure Reservations and Savings Plans; leverage hybrid benefits
5. **Monitor and optimize over time** - track spend continuously; act on cost recommendations; retire underutilized resources

## Azure Cost Tools

- **Microsoft Cost Management + Billing** - cost analysis, budgets, cost alerts, export to storage for Parquet/Athena analysis
- **Azure Advisor** - cost recommendations: resize/shutdown VMs, buy reservations, delete unused disks
- **Azure Monitor + cost alerts** - alert on budget thresholds
- **Azure Pricing Calculator** - pre-deployment cost estimation
- **Azure Cost Management Exports** - raw billing data to Azure Storage for Power BI / Excel analysis
- **Azure Carbon Optimization** (preview) - sustainability tracking for carbon footprint reporting

## Cost Optimization Areas

### Compute
- Right-size VMs using Azure Advisor; use Burstable VMs (B-series) for dev/test
- Spot VMs - up to 90% off list price for interruptible workloads (CI/CD, ML training, batch)
- Azure Batch Spot nodes - bursty HPC at spot pricing
- Auto-shutdown dev VMs outside business hours via Azure DevTest Labs or scheduled stop

### Reservations and Savings Plans
- **1yr/3yr Azure Reservations** - VMs, SQL, Cosmos DB, App Service, AKS nodes; committed capacity discount
- **Azure Savings Plans for Compute** - covers VMs, VMSS, AKS, App Service, Functions across regions, SKU families, and sizes; no instance flexibility restrictions

### Azure Hybrid Benefit
- **Windows Server** - up to 40% off VM pricing using existing Software Assurance licenses
- **SQL Server** - up to 55% off Azure SQL Database and SQL Managed Instance
- **Dev/Test pricing** - reduced rates for Visual Studio subscribers on eligible services

### Storage
- **Azure Blob lifecycle management** - tiered transition: Hot → Cool → Cold → Archive based on last access time
- **Storage Reserved Capacity** - commit to blob storage capacity for up to 3 years
- LRS vs GRS vs GZRS selection - match redundancy to actual DR requirements; avoid over-replication

### Networking
- Azure Front Door vs Application Gateway vs Load Balancer cost tradeoffs
- ExpressRoute vs VPN Gateway pricing model differences
- Egress data transfer costs - VNet peering is free; egress to internet is billed per GB

### Governance
- Management Group + Subscription tagging policy - enforce required tags via Azure Policy deny
- Cost allocation tags - chargeback/showback reporting by team, application, environment, cost-center
- Azure Policy to enforce allowed VM SKUs - prevent accidental high-cost SKU deployment

## Assessment Questions

- How do you model and predict cloud costs for your workload?
- How do you ensure resources are correctly sized for the workload?
- How do you use Azure pricing models (reservations, savings plans, spot) to reduce costs?
- How do you monitor and act on cost anomalies?
- How do you retire unused or underutilized resources?
- How do you allocate costs to teams or business units?
- How do you evaluate the cost impact of architectural decisions?

## Validation Checklist

- [ ] Azure Cost Management budgets configured per subscription with email alerts at 80% and 100%
- [ ] 100% of resources tagged with required tags (env, team, app, cost-center) via Azure Policy
- [ ] Azure Advisor cost recommendations reviewed and actioned monthly
- [ ] Azure Reservations or Savings Plans covering ≥70% of steady-state compute (VMs, AKS nodes, SQL)
- [ ] Azure Hybrid Benefit enabled for eligible Windows Server and SQL Server workloads
- [ ] Spot VMs or Azure Batch Spot nodes used for CI/CD, ML training, and dev/test workloads
- [ ] Blob Storage lifecycle policies active for all storage accounts with data older than 30 days
- [ ] Unused resources identified and decommissioned monthly: unattached disks, unused public IPs, empty resource groups, stopped VMs >7 days
- [ ] Dev/test VMs auto-shutdown scheduled outside business hours
- [ ] Cost allocation report generated monthly for chargeback/showback

## Response Shape

Cost visibility and tooling assessment → tagging compliance → reservation/savings plan coverage → rightsizing opportunities → hybrid benefit and spot adoption → storage lifecycle → idle resource inventory → prioritized savings actions

## Official Documentation

- https://learn.microsoft.com/azure/well-architected/cost-optimization/
- https://learn.microsoft.com/azure/cost-management-billing/

## Security Notes

Read-only advisory. Do not cancel Reservations, delete resources, or modify billing configurations without explicit approval and resource inventory confirmation.