Learn Editor: Update cdn-overview.md

Author: jainsabal

articles/cdn/cdn-overview.md

@@ -18,6 +18,10 @@ ROBOTS: NOINDEX
 
 [!INCLUDE [Azure CDN from Microsoft (classic) retirement notice](../../includes/cdn-classic-retirement.md)]
 
+> [!IMPORTANT]
+> Starting August 15, 2025, Azure CDN from Microsoft (classic) will no longer support new domain onboarding or profile creation. Migrate to [AFD Standard and Premium](https://ms.portal.azure.com/#"https://ms.portal.azure.com/#") to create new domains or profiles and avoid service disruption. [Learn more](https://ms.portal.azure.com/verifyLink?href=https%3A%2F%2Faka.ms%2Fcdn%2Fmigration&id=Microsoft_Azure_Cdn"https://ms.portal.azure.com/verifylink?href=https%3a%2f%2faka.ms%2fcdn%2fmigration&id=microsoft_azure_cdn")
+> Switch from Azure-managed certificates on existing domains to Bring Your Own Certificate (BYOC) or migrate to [AFD Standard and Premium](https://ms.portal.azure.com/#"https://ms.portal.azure.com/#") by August 15, 2025 to avoid service disruption. Existing managed certificates will be auto renewed before August 15, 2025, and remain valid until April 14, 2026. [Learn more](/azure/cdn/cdn-custom-ssl?toc=%2Fazure%2Ffrontdoor%2Ftoc.json&tabs=option-1-default-enable-https-with-a-cdn-managed-certificate"https://learn.microsoft.com/en-us/azure/cdn/cdn-custom-ssl?toc=%2fazure%2ffrontdoor%2ftoc.json&tabs=option-1-default-enable-https-with-a-cdn-managed-certificate")
+
 A content delivery network is a distributed network of servers that can efficiently deliver web content to users. A content delivery network store cached content on edge servers in point of presence (POP) locations that are close to end users, to minimize latency.
 
 Azure Content Delivery Network offers developers a global solution for rapidly delivering high-bandwidth content to users by caching their content at strategically placed physical nodes across the world. Azure Content Delivery Network can also accelerate dynamic content, which can't get cached, by using various network optimizations using content delivery network POPs. For example, route optimization to bypass Border Gateway Protocol (BGP).