Azure App Service — Reliability Reference

Supported Plans & Zone Redundancy

Plan	Zone Redundancy	Min Instances	Health Check
Free/Shared (F1/D1)	❌ Not supported	N/A	❌
Basic (B1/B2/B3)	❌ Not supported	N/A	✅
Standard (S1/S2/S3)	❌ Not supported	N/A	✅
Premium v2 (P1v2+)	✅ zoneRedundant: true + capacity: 2	2	✅
Premium v3 (P0v3+)	✅ zoneRedundant: true + capacity: 2	2 (recommended)	✅
Premium v4 (P0v4+)	✅ zoneRedundant: true + capacity: 2	2 (recommended)	✅
Isolated v2 (I1v2+)	✅ zoneRedundant: true + capacity: 2	2	✅

Assessment Queries

⚠️ Output format: Use --query "data[]" -o json for az graph query. -o table only shows summary columns (Count, Total_records) and hides projected fields. Standard az webapp commands work fine with -o table.

Plan Zone Redundancy

az graph query -q "
resources
| where resourceGroup =~ '<rg>'
| where type =~ 'microsoft.web/serverfarms'
| where kind !contains 'functionapp'
| project name, sku=sku.name, capacity=sku.capacity, zoneRedundant=properties.zoneRedundant, location