Create concepts-fabric-management-upgrade.md

Adding Network Fabric Controller upgrades concepts document.

Author: bartpinto

articles/operator-nexus/concepts-fabric-management-upgrade.md

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+---
+title: Azure Operator Nexus Network Fabric management upgrade overview
+description: Get an overview of Nework Fabric management upgrade for Azure Operator Nexus.
+author: bartpinto
+ms.author: bpinto
+ms.service: azure-operator-nexus
+ms.topic: conceptual
+ms.date: 07/16/2025
+ms.custom: template-concept
+---
+
+# Operator Nexus Network Fabric management upgrades
+Operator Nexus releases various functionality and bug fixes throughout the product lifecycle to update the Azure resources and on-premises extensions, critical in communications back to Azure. 
+
+## Scope
+The releases update components on the Network Fabric Controller to enable new functionality, while maintaining backwards compatibility for the customer. Additionally, new runtime releases are made available and accessed via [Network Fabric Upgrades](./howto-upgrade-nexus-fabric.md).
+
+For Fabric Device management, Microsoft delivers new software to the extensions and agents that exist on the platform to provide new functionality and maintain security and communication back to Azure.
+
+## Delivery
+The update rolls out to the Azure regions and the Network Fabric Controller is updated when the release is available in that region.
+
+## Impact to customer workloads
+There is no disruption to running workloads or instantiating new workloads, and on-premises resources retain availability throughout the upgrade. Therefore, the customer sees no impact. 
+
+## Duration of on-premises updates
+These updates take up to one hour to complete per Network Fabric.
+
+## Related Information
+For concepts on Cluster management upgrades, see [Azure Operator Nexus Cluster management upgrade overview](./concepts-cluster-management-upgrade.md).