Merge pull request #307988 from dominicbetts/adr-limits-constraints

ADR: limits and constraints

Author: Carolyn135

articles/azure-resource-manager/management/azure-subscription-service-limits.md

@@ -354,6 +354,10 @@ The following table details the features and limits of the Basic, Standard, and
 
 [!INCLUDE [database-migration-service-limits](../../../includes/database-migration-service-limits.md)]
 
+## Azure Device Registry limits
+
+[!INCLUDE [device-registry-limits](../../iot-operations/includes/device-registry-limits.md)]
+
 ## Azure Device Update for IoT Hub limits
 
 [!INCLUDE [device-update-for-iot-hub-limits](../../../includes/device-update-for-iot-hub-limits.md)]
@@ -532,7 +536,7 @@ See [VM Applications overview](/azure/virtual-machines/vm-applications) for more
 
 A limit of 5,000 disk encryption sets are allowed per region and per subscription. [Contact Azure support](../../communications-gateway/request-changes.md) to increase the quota. 
 
-See the following documentation to learn more about about encryption restrictions:
+See the following documentation to learn more about encryption restrictions:
 
 - [Linux](/azure/virtual-machines/disk-encryption#restrictions)
 - [Windows](/azure/virtual-machines/disk-encryption#restrictions) virtual machines

articles/iot-operations/includes/device-registry-limits.md

@@ -0,0 +1,32 @@
+---
+author: dominicbetts
+ms.author: dobett
+ms.service: azure-device-registry
+ms.topic: include
+ms.date: 11/07/2025
+---
+
+The following table lists the limits that apply to the Azure Device Registry resources. Azure Device Registry is used with Azure IoT Hub (preview) and Azure IoT Operations.
+
+| Resource type | Limit type | Limit |
+|---------------|------------|-------|
+| Azure Device Registry namespaces | Count per Azure subscription | 100 |
+| Devices | Count per Azure subscription | 100,000 |
+| Devices / discovered devices | Count per Kubernetes cluster | 1,000 |
+| Devices / discovered devices | Count per Azure Device Registry namespace | 10,000 |
+| Devices / discovered devices (read) | Operations per minute per Azure subscription | 5,000 |
+| Devices / discovered devices (create/update) | Operations per minute per Azure subscription | 500 |
+| Assets  / discovered assets | Count per Azure Device Registry namespace | 10,000 |
+| Assets / discovered assets | Count per Kubernetes cluster | 1,000 |
+| Assets / discovered assets (read) | Operations per minute per Azure subscription | 5,000 |
+| Assets / discovered assets (create/update) | Operations per minute per Azure subscription | 500 |
+| Assets: datasets, event groups, and management groups | Count per asset | 100 |
+| Assets: data points, events, and management actions | Count per asset | 1,000 |
+| Assets (classic) | Count per Azure subscription | 10,000 |
+| Schema registries | Count per Azure subscription | 100 |
+| Schemas | Read operations per minute per Azure subscription | 600 |
+| Schema versions | Read operations per minute per Azure subscription | 600 |
+| Schema registries | Read operations per minute per Azure subscription | 600 |
+| Policies (preview) | Count per Azure Device Registry namespace | 1 |
+| Credentials (preview) | Count per Azure Device Registry namespace | 1 |
+| Credentials (preview) | Count per Entra ID tenant | 2 |