Merge pull request #2728 from MicrosoftDocs/main638930341409405578sync_temp

For protected branch, push strategy should use PR and merge to target branch method to work around git push error

Author: learn-build-service-prod[bot]

data-explorer/pricing-cost-drivers.md

@@ -82,6 +82,11 @@ This section explores the key factors that influence the cost per GB ingested in
 
 In ADX, all ingested data is stored in persistent storage. Each table and materialized view has a **retention policy** that defines how long the data is kept. The longer the data is retained, the higher the cost, based on Azure Storage pricing. When you need long-term storage, like for compliance, the cost per GB ingested increases because it includes ongoing storage expense.
 
+In addition to the extent size reported by the cluster, there are two additional cost drivers:
+
+* **Retention buffer**: An extra 7 days of data is stored by default to protect against accidental data loss.
+* **Recoverability overhead**: For tables where the [recoverability setting](/kusto/management/retention-policy?view=azure-data-explorer&preserve-view=true#the-policy-object) is enabled (default), data is retained for an additional 14 days. This includes intermediate blobs generated during merge and rebuild operations.
+
 ### Cluster size
 
 * Cluster size is the number of machines (nodes) in the cluster. Each machine adds cost, depending on its type (SKU). **Autoscale** adjusts the cluster size based on CPU usage, so the system can optimize cost and performance by avoiding idle or redundant resources.