Azure Reliability

Azure Reliability Assessment & Configuration

Quick Reference

When to Use This Skill

Activate this skill when user wants to:

• "Assess my Function app's reliability"
• "Assess my Web app's reliability"
• "Check the reliability of my resource group" (App Service and Functions resources only)
• "Is my app zone redundant?" (App Service and Functions resources only)
• "Is my app service plan zone redundant?"
• "Make my app zone redundant" (App Service and Functions resources only)
• "Make my app service plan zone redundant"
• "Set up multi-region failover for my app" (App Service and Functions resources only)
• "Check my reliability posture"
• "Find single points of failure" (App Service and Functions resources only)
• "Enable high availability for my app" (App Service and Functions resources only)
• "Check disaster recovery readiness"
• "Improve my app's resilience" (App Service and Functions resources only)

Scope note: This skill currently covers Azure Functions and Azure App Service only. If the user asks about Azure Container Apps reliability, acknowledge that support is planned but not yet available, and only proceed with the parts that apply to App Service and Functions resources in scope.

Prerequisites

• Authentication: user is logged in to Azure via az login
• Permissions: Reader access on target subscription/resource group (for assessment)
• Permissions: Contributor access (for configuration changes)
• Azure Resource Graph extension: az extension add --name resource-graph

MCP Tools

Primary query method: Azure Resource Graph via az graph query (requires az extension add --name resource-graph).

Assessment Workflow

Phase 1: Discover Resources

1. Identify scope — Ask user for resource group, subscription, or app name
2. Query Azure Resource Graph to discover all resources in scope
3. Classify resources by service type (Functions, Storage, etc.). If Container Apps is found, note it but do not deep-dive.

Important: Always scope queries to the user's specified resource group or subscription. Add these filters to every Resource Graph query:

• Resource group: | where resourceGroup =~ '<rg-name>'
• Subscription: Use --subscriptions <sub-id> flag on az graph query
• App name: | where name =~ '<app-name>'

Phase 2: Assess Reliability

Two-step assessment: platform-level discovery first, then per-service deep dive.

Step 1 — Platform discovery (find what's there). Use these to enumerate resources in scope and detect cross-cutting reliability gaps:

Step 2 — Per-service deep dive. For each compute resource discovered in Step 1, load the matching service reference. The service reference is the single source of truth for that service's plan/SKU rules, assessment queries, CLI commands, IaC patches (Bicep + Terraform + AVM), and reporting hints.

This skill version ships only the Azure Functions and App Service per-service references. Other compute services are listed below explicitly so the dispatch logic is unambiguous: if a resource matches an unsupported row, do not attempt to load a reference, fabricate CLI commands, or generate IaC patches for it.

Handling unsupported services: If a resource matches an unsupported row above, surface it in the discovery summary, mark it as ⚪ not assessed (planned) in the Phase 3 table, and skip the per-service remediation steps for it. Do not attempt to fabricate CLI commands or IaC patches for those services.

Phase 3: Generate Reliability Checklist

Present findings as a feature-pivoted table: one row per reliability feature (Zone redundancy on compute, Zone-redundant storage, Health probes, Multi-region failover), with a single status indicator and the specific resources that are relevant to that feature. This avoids the noise of one-row-per-resource with mostly n/a cells. Do not assign numeric scores or grades.

🔍 Reliability Assessment — {scope}
─────────────────────────────────────────────────────────────────────────────────────────────
Reliability Feature              Status      Resources
─────────────────────────────────────────────────────────────────────────────────────────────
Zone redundancy — compute        🔴 OFF      • plan-web-ii5trxva2ark4 (P1v3)
                                              • plan-ii5trxva2ark4 (FC1)

Zone-redundant storage           🔴 GRS      • stii5trxva2ark4 (defaulted; no SKU set in IaC)

Health probes                    🔴 OFF      • func-api-ii5trxva2ark4 — needs code change (FC1)
                                              • app-web-ii5trxva2ark4 — no health check path

Multi-region failover            🔴 OFF      • Single region (eastus) only — Front Door not configured
─────────────────────────────────────────────────────────────────────────────────────────────

Want me to fix the 🔴 items? I'll do the quick wins first (App
plan zone redundancy + health checks on supported plans), then ask before
storage migration and multi-region setup. (yes/no)

Rules for the table:

• Four feature rows, in this order: Zone redundancy — compute · Zone-redundant storage · Health probes · Multi-region failover. Omit a row entirely only if no resource in scope could ever apply to it.
• Status column is one symbol + one short word, no other characters:
  • 🟢 ON — feature is fully enabled across all relevant resources in scope
  • 🟡 PARTIAL — some resources have it, some don't (or partial config like liveness-only)
  • 🔴 OFF — feature is missing on all relevant resources
  • For storage, replace OFF with the current SKU when relevant (🔴 LRS, 🔴 GRS, 🟢 ZRS, 🟢 GZRS). When no SKU is set in IaC, label as 🔴 GRS (ARM/AVM default) and note that in the resource line.
• Resources column lists only what's relevant to that feature, one bullet per resource:
  • For "needs fixing" resources, include a short inline reason ((FC1), (defaulted; no SKU set), liveness only, needs code change (FC1)).
  • For resources that are already ON for that feature, mention them on the same row with — already ON so the user sees credit for what's right.
• Do not include n/a, —, or empty cells. If a feature doesn't apply to any resource in scope, drop the row.
• Do not include numeric scores, grades, or point totals.
• End the assessment with a single yes/no question that kicks off the staged remediation flow. Do not enumerate the per-resource fix list here — the user will see it after they say yes (Configuration Workflow Step 1).

UX Note: If the assessment finds the app already has all core reliability features (zone redundancy, ZRS/GZRS storage, health probes), skip the fix-it question and jump straight to Configuration Workflow Step 3 (Multi-region follow-up). Do NOT start any multi-region work without explicit consent.

Configuration Workflow

When user wants to fix findings from the assessment:

⛔ ALWAYS confirm with user before executing changes. Show what will change, any cost implications, and any destructive actions (e.g., environment recreation).

Step 1: Present Fix Plan + Choose Path

After assessment, if user says "fix it" / "improve my reliability" / "enable zone redundancy":

1. List each fixable finding with the specific action
2. Flag any cost implications or breaking changes
3. Ask user which path they want:

I'll start with the quick wins (no downtime, fast):

1. ✏️  Enable zone redundancy on plan-ii5trxva2ark4 (Flex Consumption — no cost change)
2. ✏️  Set health check path to /api/health on func-api-ii5trxva2ark4

Then, separately, I'll ask if you want to upgrade storage:

3. 🕒  Upgrade stii5trxva2ark4 from LRS → ZRS (small cost increase, migration takes hours)
   — Required for full zone redundancy, but I'll confirm with you before starting.

How would you like to apply these changes?

  A) Fix now — Run az CLI commands against your live resources (immediate, one-time)
  B) Patch my IaC — Update your Bicep/Terraform files so changes persist across deploys

(If you use azd or Terraform, option B is recommended so `azd up` won't overwrite changes.)

Path A: Fix Now (CLI)

Run fixes against live resources using az CLI commands. Quick wins first, then ask before the slow storage migration.

The exact CLI commands per service live in the per-service references — pick the one(s) matching the resources discovered in Phase 2:

Execution order — always quick wins first:

1. Zone redundancy on compute (fast, in-place property update on the App's plan).

2. Health probes (Premium / Dedicated only — in-place; for FC1 / Consumption, follow the consent gate in configure-health-probes.md).

3. Verify the compute changes succeeded before doing anything else.

4. ⛔ STOP — Ask about storage upgrade. Compute is now zone-redundant, but storage may still be LRS or GRS. Ask the user explicitly:

   ✅ Compute is now zone-redundant.
   
   To be **fully zone-redundant**, your storage account also needs to be upgraded:
     • stii5trxva2ark4: currently `Standard_LRS` → needs `Standard_ZRS`
   
   ⚠️  This is a live storage redundancy conversion:
      • Takes hours to days depending on data volume
      • Small ongoing cost increase (~$0.01/GB/month more)
      • Only supported for Standard general-purpose v2 accounts
   
   Do you want me to start the storage migration now? (yes / no / later)

   • yes → run az storage account update --sku Standard_ZRS (or migration start if needed); poll az storage account show --query sku.name until it reports Standard_ZRS.
   • no / later → leave storage as-is; note in the re-assessment that ZR storage remains a gap.

5. Multi-region — do NOT auto-run. Handled in Step 3 below as an explicit follow-up after re-assessment.

⚠️ Warning: If the user uses azd up or terraform apply later, CLI-only changes may be overwritten by the IaC definitions. Recommend also patching IaC after CLI fixes.