Add image to Azure Monitor cost usage article

Author: bwren

articles/azure-monitor/cost-usage.md

@@ -104,6 +104,9 @@ Since a usage export has both the number of units of usage and their cost, you c
 
 You can also see these data benefits in the Log Analytics Usage and estimated costs page. If the workspace is receiving these benefits, there will be a sentence below the cost estimate table that gives the data volume of the benefits used over the last 31 days. 
 
+:::image type="content" source="media/cost-usage/log-analytics-workspace-benefit.png" lightbox="media/cost-usage/log-analytics-workspace-benefit.png" alt-text="Screenshot of monthly usage with benefits from Defender and Sentinel offers.":::
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 ### Query benefits from the Operation table
 
 The [Operation](/azure/azure-monitor/reference/tables/operation) table contains daily events which given the amount of benefit used from the [Defender for Servers data allowance](logs/cost-logs.md#workspaces-with-microsoft-defender-for-cloud) and the [Microsoft Sentinel benefit for Microsoft 365 E5, A5, F5, and G5 customers](https://azure.microsoft.com/offers/sentinel-microsoft-365-offer/). The `Detail` column for these events are all of the format `Benefit amount used 1.234 GB`, and the type of benefit is in the `OperationKey` column. Here is a query that charts the benefits used in the last 31-days: