Public preview: Network observability add-on for AKS

The new network observability add-on for AKS, now in public preview, provides complete observability into the network health and connectivity of your AKS cluster. Key benefits: * Get access to cluster level network metrics like packet drops, connections stats and more. * (GA) Access to pod-level metrics and network debuggability features * Support for all Azure CNIs - AzureCNI and AzureCNI (Powered by Cilium) * Support for all AKS node types - Linux and Windows * Easy deployment using native Azure tools - AKS CLI, ARM templates, PowerShell, etc. * Seamless integration with the Azure managed Prometheus and Azure-managed Grafana offerings. Read more in the [network observability add-on documentation](https://aka.ms/NetObsAddonDoc) and in our [blog](https://aka.ms/NetObsAddonBlog). * Azure Kubernetes Service (AKS) * Azure Managed Grafana * Managed Prometheus * Features * [ Azure Kubernetes Service (AKS)](https://azure.microsoft.com/en-gb/products/kubernetes-service/) * [ Azure Managed Grafana](https://azure.microsoft.com/en-gb/services/managed-grafana/)