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Messaging Pairing Constraints
Event Grid Topic
| Paired With |
Constraint |
| Event Subscriptions |
Subscriptions are child resources. Delivery endpoints include: Webhook, Azure Function, Event Hub, Service Bus Queue/Topic, Storage Queue, Hybrid Connection. |
| Private Endpoint |
Only available with Premium SKU. Set publicNetworkAccess: 'Disabled' when using private endpoints exclusively. |
| Managed Identity |
Required for dead-letter destinations and delivery to Azure resources that require authentication (Event Hub, Service Bus, Storage). |
| Function App |
Use Event Grid trigger binding. Subscription endpoint type is AzureFunction. Function must have Event Grid extension registered. |
| Event Hub |
Subscription endpoint type is EventHub. Provide the Event Hub resource ID. Requires managed identity or connection string. |
| Storage Queue |
Subscription endpoint type is StorageQueue. Provide storage account ID and queue name. |
| Dead Letter |
Dead-letter destination must be a Storage blob container. Requires managed identity or storage key for access. |
Event Hub
| Paired With |
Constraint |
| VNet |
Standard, Premium, and Dedicated SKUs support VNet service endpoints and private endpoints. |
| Zone Redundancy |
Available in Standard (with ≥4 TU recommended) and Premium. |
| Kafka |
Kafka protocol support available in Standard and Premium only (not Basic). |
| Capture |
Event capture to Storage/Data Lake available in Standard and Premium only. |
| Consumer Groups |
Basic: 1 consumer group. Standard: 20. Premium: 100. Dedicated: 1,000. |
| Retention |
Basic: 1 day. Standard: 1–7 days. Premium: up to 90 days. |
| Function App |
Event Hub trigger uses connection string or managed identity. Set EventHubConnection in app settings. |
Service Bus
| Paired With |
Constraint |
| Topics |
Only Standard and Premium SKUs support topics and subscriptions. Basic supports queues only. |
| VNet |
Only Premium SKU supports VNet service endpoints and private endpoints. |
| Zone Redundancy |
Only Premium SKU supports zone redundancy. |
| Partitioning |
Premium messaging partitions cannot be changed after creation. |
| Message Size |
Basic/Standard: max 256 KB. Premium: max 100 MB. Plan accordingly for large payloads. |
| Function App |
Service Bus trigger uses connection string or managed identity. Set ServiceBusConnection in app settings. |