Azure Functions — Reliability Reference
Supported Plans & Zone Redundancy
| Plan | Zone Redundancy | Min Instances | Health Check |
|---|---|---|---|
| Flex Consumption (FC1) | ✅ zoneRedundant: true | Auto-managed | ❌ Platform health check not supported |
| Premium (EP1/EP2/EP3) | ✅ zoneRedundant: true + sku.capacity: 2 | minimumElasticInstanceCount: 2 per app | ✅ healthCheckPath |
| Consumption (Y1) | ❌ Not supported | N/A | ❌ Not supported |
| Dedicated (P1v2+) | ✅ (treated as App Service) | sku.capacity: 2 | ✅ healthCheckPath |
Assessment Queries
Zone Redundancy Check
bash
az graph query -q "
resources
| where resourceGroup =~ '<rg>'
| where type =~ 'microsoft.web/serverfarms'
| where kind contains 'functionapp' or kind =~ 'linux' or kind =~ 'elastic'
| project name, sku=sku.name, zoneRedundant=properties.zoneRedundant, location