TLS 1.0 and 1.1 depreciation

Author: spelluru

articles/event-grid/overview.md

@@ -62,6 +62,9 @@ Event Grid offers a rich mixture of features. These features include:
 - **High throughput** - Build high-volume integrated solutions with Event Grid.
 - **Custom domain names** - Allows users to assign their own domain names to Event Grid namespace's HTTP endpoints, enhancing security and simplifying client configuration.
 
+> [!NOTE]
+> **Regarding TLS 1.0 / 1.1 deprecation**: For system topics, you need to take action only for the event delivery to webhook destinations. If the destination supports TLS 1.2, the event delivery happens using 1.2. If the destination doesn't support TLS 1.2, the event delivery automatically falls back to 1.0 and 1.1. Post Oct 31st 2024, event delivery using 1.0 and 1.1 won't be supported. Ensure that your webhook destinations support TLS 1.2. One easy way to check for TLS 1.2 support is to use [Qualys SSL Labs](https://www.ssllabs.com/ssltest/). If the report shows that TLS 1.2 is supported, no action is required. For more information, see the following blog post: [Retirement: Upcoming TLS changes for Azure Event Grid](https://azure.microsoft.com/updates/v2/TLS-changes-for-Azure-Event-Grid)
+
 ## Use cases
 
 Event Grid supports the following use cases: