preview & not eligible for support

Author: spelluru

articles/event-hubs/log-compaction.md

@@ -11,8 +11,12 @@ ms.custom: ignite-2022
 Log compaction is a way of retaining data in Event Hubs using event key based retention. By default, each event hub/Kafka topic is created with time-based retention or *delete* cleanup policy, where events are purged upon the expiration of the retention time. Rather using coarser-grained time based retention, you can use event key-based retention mechanism where Event Hubs retrains the last known value for each event key of an event hub or a Kafka topic. 
 
 > [!NOTE] 
+> This feature is currently in Preview.
 > Log compaction feature is available only in **premium** and **dedicated** tiers. 
 
+> [!WARNING]
+> Use of the Log Compaction feature is **not eligible for product support through Microsoft Azure**.
+
 As shown below, an event log (of an event hub partition) may have multiple events with the same key. If you're using a compacted event hub, then Event Hubs service will take care of purging old events and only keeping the latest events of a given event key. 
 
 :::image type="content" source="./media/event-hubs-log-compaction/log-compaction.png" alt-text="Diagram showing how a topic gets compacted." lightbox="./media/event-hubs-resource-governance-overview/app-groups.png":::